資源簡介 / 讓學(xué)習(xí)更有效 新課備課備考 | 英語學(xué)科/ 讓學(xué)習(xí)更有效 新課備課備考 | 英語學(xué)科2025年仁愛科普版九年級英語上冊精講精練Unit 2 Saving the Earth核心語法:條件狀語從句一、基本概念條件狀語從句表示"如果...就..."的邏輯關(guān)系,由if(如果)或unless(除非)引導(dǎo),分為三類:類型 結(jié)構(gòu)特點(diǎn) 用法真實(shí)條件句 主句用將來時,從句用一般現(xiàn)在時 表示可能實(shí)現(xiàn)的假設(shè)虛擬條件句 主從句時態(tài)倒退一級 表示不太可能或與事實(shí)相反的假設(shè)unless條件句 unless = if not 表示"除非...否則..."二、真實(shí)條件句(第一類條件句)結(jié)構(gòu): If + 一般現(xiàn)在時,主語 + will/can/may + 動詞原形功能: 描述可能發(fā)生的條件及其結(jié)果例句:If it rains tomorrow, we will cancel the picnic.You can borrow my book if you return it on time.If he doesn't hurry, he may miss the train.注意:主句可以用祈使句代替將來時:If you see Tom, tell him to call me.主將從現(xiàn)原則:從句用現(xiàn)在時表將來三、虛擬條件句(第二類條件句)結(jié)構(gòu): If + 一般過去時,主語 + would/could/might + 動詞原形功能: 表示與現(xiàn)在事實(shí)相反或不太可能實(shí)現(xiàn)的假設(shè)例句:If I were you, I would accept the offer.(事實(shí):我不是你)If he had more time, he might travel abroad.(事實(shí):他沒有時間)We could buy a house if we earned more money.(事實(shí):收入不夠)特殊注意:be動詞在虛擬語氣中一律用were(包括I/he/she)可省略if用倒裝結(jié)構(gòu):Were I rich (=If I were rich), I would donate to charity.四、unless的用法unless = if not,但語氣更強(qiáng),表示"除非...否則..."對比練習(xí):You'll fail the exam if you don't study.→ You'll fail the exam unless you study.The plant will die if it isn't watered.→ The plant will die unless it is watered.注意:unless從句必須用肯定形式不可用于虛擬條件句( Unless I were...)五、易混淆點(diǎn)辨析1、if條件句 vs when時間狀語從句if條件句 when時間從句表示不確定是否發(fā)生 表示確定會發(fā)生If I go to Beijing,... When I go to Beijing,...2、真實(shí)條件句與虛擬條件句對比真實(shí)條件句 虛擬條件句If it is sunny, we will go. If it were sunny, we would go.(可能實(shí)現(xiàn)) (實(shí)際現(xiàn)在陰天)六、總結(jié)口訣條件從句分三類,主將從現(xiàn)記心扉,虛擬語氣用過去,unless把if not推!1.We will stay at home _________ it rains tomorrow.A.a(chǎn)nd B.so C.but D.if2.You can come with us _________ you want.A.if B.a(chǎn)nd C.so D.because3.—Is it interesting to play computer games —Yes, ________ you are interested in playing computer games, you’ll have trouble giving it up.A.once B.twice C.a(chǎn)s4.You will not succeed ______ you work even harder.A.though B.if C.since D.unless5.Our school basketball team will win the next match _________ they practise more.A.if B.before C.though D.while6.If Mary________ late tomorrow,the teacher won't let her in.A.is B.will be C.be D.was7.This method worked well at night _________ the weather was good and the stars could be seen.A.a(chǎn)s short as B.a(chǎn)s soon as C.a(chǎn)s long as D.a(chǎn)s far as8.A tourist will easily lose his way in Beijing __________ he has a map or a guide.A.if B.because C.unless D.when9.We can go out for a walk ________ the rain stops.A.so B.but C.once10.—Your aunt often walks a dog in the morning.—Yeah, ________ the bad weather stops her.A.when B.unless C.because D.since11.—Can students go online during lessons —They can ________ it is for that lesson.A.a(chǎn)nd B.but C.if D.so12.She won’t pass the exam she works hard.A.if B.unless C.when D.while13.You will feel happy at school ________ you get on well with your classmates.A.though B.because C.unless D.if14.Miss Xu goes jogging in Huanghe Park every morning ________ it rains.A.unless B.till C.since D.a(chǎn)s15.________ you can use your dictionary, you will learn English better.A.If B.Unless C.Though D.Before16.She can visit the Canton Tower if she ________ to Guangzhou.A.go B.goes C.won’t go D.doesn’t go17.________ we continue to pull together, we’ll keep winning the game.A.As long as B.Even though C.As soon as D.Because18.—Do you know if he __________to play football with us —I think he will come if he __________free tomorrow.A.comes; is B.comes; will be C.will come; is D.will come; will be19.Everyone may have a chance to be successful ________ everyone tries his best.A.before B.if C.when D.because20.You will miss the bus ________ you hurry up.A.if B.or C.unless D.so21.Even if we learn something well, we will forget it________ we use it.A.while B.until C.unless D.when22.If I ________ to the park, I ________ my homework today. And my mom will be angry.A.go; won’t finish B.will go; finish C.go; will finish D.will go; will finish23.—Can I go to the reading room —You can’t __________ you have a student ID card. It’s only for students.A.if B.because C.unless D.though24.Bob promises he will join in the football match _______ he has to help his parents on the farm.A.if B.a(chǎn)s C.unless D.whether25.She says that she'll have to close the restaurant ______ business improves.A.if B.a(chǎn)fter C.unless D.when26.You are unlikely to pass the exam ________ you study with great diligence and focus.A.a(chǎn)s B.because C.if D.unless27.—My sister is not going to eat many hamburgers.—If she ________, she will lose weight.A.does B.doesn’t C.will D.won’t28.Life is like a mirror. If you smile at it, it ______ back.A.has smiled B.will smile C.smiled D.is smiling29.If you ________ something, you move it higher.A.rise B.raise C.will rise D.will raise30.— Do you think ________ she has taken the book on your table — ________ I’m mistaken.A.that; Unless B.whether; Unless C.that; If D.whether; If31.You will never know how great you are ________ you try your best.A.since B.though C.unless D.because32.You are not supposed to go to a family party unless you ________ to in the US.A.a(chǎn)re not invited B.a(chǎn)re invited C.will be invited33.________ you try, you will never succeed.A.Because B.Unless C.If D.When34.We will make fewer mistakes __________ we are careful enough.A.a(chǎn)s long as B.so that C.a(chǎn)s far as D.even if35.The snow ________ quickly if it is sunny.A.melts B.melt C.won’t melt D.will melt36.If I have time, I ________ a talk with you.A.have B.going to have C.had D.will have37.I don't know if it _________ tomorrow. If it _________, we will stay at home together.A.snows; snows B.will snow; snowsC.snows; will snow D.will snow; will snow38.—I’m not good at my lessons. What can I do —Nothing is impossible ________ you work hard.A.a(chǎn)s long as B.a(chǎn)s soon as C.a(chǎn)s far as39.—Would you like to help me clean the house this weekend —I’d like to ________ I finish my homework.A.before B.though C.if D.so40.If you ________ to bed early, you will not feel tired in the morning.A.go B.goes C.went D.will go41.We won’t put off the sports meeting _______it rains .A.if B.unless C.a(chǎn)s soon as D.so that42.I will be very happy ________ you come to my party.A.if B.though C.or D.a(chǎn)nd43.What a hot day! Food will go bad quickly ________ we put it into the fridge.A.before B.a(chǎn)lthough C.while D.unless44.I don't know ________ he will come tomorrow. ________ he comes, I'll tell you.A.if; Whether B.whether; WhetherC.if; That D.if; If45.As we live in a rapidly developing world, we will be left behind ________ we keep learning.A.unless B.if C.a(chǎn)fter D.though46.You’d better travel around Nanjing with a local tour guide, ________ you want to know more about its culture.A.unless B.until C.a(chǎn)lthough D.if47.Students may forget what they learn quickly________they use it more often.A.if B.unlessC.a(chǎn)lthough D.because48.In China, you can call 110 and ask the police for help ________ you get into trouble.A.a(chǎn)lthough B.if C.before D.so49.You will not get the special gift ________ you finish all the tasks.A.a(chǎn)fter B.because C.while D.unless50.Put your hand up ________ you know the answer.A.if B.until C.before51.I will have enough money to go to school _________ I get a job.A.only if B.a(chǎn)s if C.if so D.if not52.We’ll go to the Great Wall, ________ it doesn’t rain this Saturday.A.when B.if C.until D.because53.Lucy, what about going camping if it ________ tomorrow A.didn’t rain B.doesn’t rain C.won’t rain D.rains54.We will go for a picnic ________ it rains tomorrow.A.when B.if C.since D.unless55.I will go on a trip with my classmates if it ________ tomorrow.A.won’t rain B.isn’t raining C.didn’t rain D.doesn’t rain56.I don’t know if it ________ sunny tomorrow. If it ________ sunny, I will go fishing.A.will be; is B.is; will beC.will be; is going to be D.is; is57.I will finish the book ________ I feel tired.A.if B.unless C.until D.because58.—Does your aunt often exercise in the South Lake Park in the morning —Yes, ________ bad weather stops her.A.a(chǎn)s B.because C.unless59.Ms. White will be happy _______ we have a surprise party for her.A.a(chǎn)s B.if C.or D.until60.What will you do if you ________ to the old folk’s home A.go B.went C.going D.will go61.—Don’t forget to protect your eyes well ________ you take online classes.—OK. Thank you, sir.A.if B.or C.so D.till62.If the robot ________ wrong, you can get a new one for free or get all your money back.A.went B.goes C.would go D.will go63.I wonder if he ________ time tomorrow;if he ________ free, I’ll invite him to give a speech in our school.A.will have; is B.has; will be C.will; have D.has; is64.We won’t believe it ________ we see it with our own eyes.A.because B.unless C.if D.a(chǎn)fter65.I________her the answer if she________me.A.can tell, will ask B.will tell, will askC.would tell, ask D.will tell, asks66.If Peter________ time this evening, he ________ to our party.A.doesn’t have; doesn’t come B.won’t have; doesn’t comeC.won’t have; won’t come D.doesn’t have; won’t come67.Our dreams will come true ________ we don’t lose hope in trouble.A.though B.a(chǎn)s long as C.because D.so68.We’re not sure if it ________ tomorrow. If it ________, we won’t climb the South Hill.A.will rain, rains B.will rain, will rain C.rains, rains D.rains, will rain/ 讓學(xué)習(xí)更有效 新課備課備考 | 英語學(xué)科/ 讓學(xué)習(xí)更有效 新課備課備考 | 英語學(xué)科21世紀(jì)教育網(wǎng)(www.21cnjy.com)21世紀(jì)教育網(wǎng)(www.21cnjy.com)參考答案及試題解析1.D【解析】句意:如果明天下雨,我們就待在家里。考查連詞辨析。and和;so因此;but但是;if如果。“it rains tomorrow”是“We will stay at home”的肯定條件,用if引導(dǎo)條件狀語從句,故選D。2.A【解析】句意:如果你想來,你可以和我們一起來。考查連詞辨析。if如果,引導(dǎo)條件狀語從句;and和,表示并列關(guān)系;so因此,表示因果關(guān)系;because因?yàn)椋龑?dǎo)原因狀語從句。分析語境可知,后半句“you want”是一個條件,表示“如果你想”,整個句子表示的是一個條件狀語從句,即“如果你想來(滿足這個條件),你可以和我們一起來”。因此,空處應(yīng)用連詞if。故選A。3.A【解析】句意:——玩電腦游戲有趣嗎? ——是的,一旦你對玩電腦游戲感興趣,你就很難放棄。考查條件狀語從句。once一旦;一次;twice兩次;as因?yàn)椤8鶕?jù)“…you are interested in playing computer games, you’ll have trouble giving it up.”可知一旦你對玩電腦游戲感興趣,就很難放棄,應(yīng)用once引導(dǎo)條件狀語從句。故選A。4.D【解析】句意:除非你更加努力工作,否則你不會成功。考查連詞辨析。though雖然;if如果;since自從;unless除非。根據(jù)“You will not succeed…you work even harder.”可知,此處是unless引導(dǎo)的條件狀語從句,意為“除非更加努力工作,否則不會成功”。故選D。5.A【解析】句意:如果我們學(xué)校的籃球隊練習(xí)更多的話,他們將贏得下一次比賽。考查連詞。if如果;before在……之前;though盡管;while當(dāng)……時候。此處是條件狀語,用if引導(dǎo)條件狀語從句,表示“如果”。故選A。6.A【解析】句意:如果Mary明天遲到,老師就不讓她進(jìn)來。考查時態(tài)。根據(jù)"If Marylate tomorrow"可知這是一個if引導(dǎo)條件狀語從句,又根據(jù)"the teacher won't let her in"是主句,主句中使用了一般將來時,所以要在if引導(dǎo)的條件狀語從句中使用一般現(xiàn)在時來代替一般將來時,又因?yàn)樵趶木渲械闹髡Z是Mary,是第三人稱單數(shù),所以要用is來填空,故選A。7.C【解析】句意:這個方法在晚上效果很好,只要天氣好并且星星能被看見。考查連詞辨析。as short as像……一樣短;as soon as一……就;as long as只要;as far as據(jù)……。“the weather was good and the stars could be seen.”是“This method worked well at night”的條件,故選C。8.C【解析】句意:一名游客在北京會很容易迷路,除非他有地圖或者向?qū)А?br/>考查從屬連詞辨析。if如果;because因?yàn)椋籾nless除非;when當(dāng)……時。分析兩句之間的邏輯,可知后句表?xiàng)l件,且含“除非”之意,應(yīng)該用unless引導(dǎo)條件狀語從句,故選C。9.C【解析】句意:雨一停我們就可以出去散步。考查連詞辨析。so所以(表因果);but但是(表轉(zhuǎn)折);once一旦(表?xiàng)l件)。空格后“the rain stops”是出去散步的條件,需用“once”連接。故選C。10.B【解析】句意:——你的姑姑經(jīng)常在早晨遛狗。——是的,除非壞天氣阻止了她。考查從屬連詞辨析。when何時;unless 除非;because因?yàn)椋籹ince自從。根據(jù)“the bad weather stops her”可知天氣原因是前提條件。故選B。11.C【解析】句意:——學(xué)生上課期間可以上網(wǎng)嗎?——如果是為了上課,他們可以上網(wǎng)。考查連詞辨析。and 和,與,表并列;but 但是,表轉(zhuǎn)折;if 如果,表?xiàng)l件; so所以,表結(jié)果。答句是條件狀語從句,需用 if 連接。 故選C。12.B【解析】句意:她不能通過考試,除非她努力學(xué)習(xí)。考查狀語從句。if如果;unless除非;when當(dāng)……時候;while當(dāng)……時候。分析句子的邏輯關(guān)系可知“she works hard”是“She won’t pass the exam”的條件,由句意可知此處指“如果不”,用unless。故選B。13.D【解析】句意:如果你和同學(xué)相處融洽,你在學(xué)校會感到快樂。考查連詞辨析。though盡管,雖然;because因?yàn)椋籾nless除非;if如果。分析句子可知,后句是前句的肯定條件,需用if“如果”,引導(dǎo)條件狀語從句,故選D。14.A【解析】句意:除非下雨,徐小姐每天早上都去黃河公園慢跑。考查連詞辨析。unless除非;till直到……為止;since自從;as因?yàn)椤!癷t rains”是“徐小姐每天早上都去黃河公園慢跑”的否定條件,用unless引導(dǎo)條件狀語從句。故選A。15.A【解析】句意:如果你能使用字典,你會學(xué)英語學(xué)得更好。考查從屬連詞辨析。If如果;Unless除非;Though雖然;Before在……之前。根據(jù)“…you can use your dictionary, you will learn English better.”可知,此處空后為條件,且為肯定條件,使用if引導(dǎo)條件狀語從句,故選A。16.B【解析】句意:如果他來廣州,他會來參觀廣州塔。考查動詞時態(tài)。go去,動詞原形;goes去,第三人稱單數(shù)形式;won’t go不去,一般將來時的否定形式;doesn’t go不去,一般現(xiàn)在時的否定形式。根據(jù)題意可知,此句是一般現(xiàn)在時,if引導(dǎo)條件狀語從句,要用主將從現(xiàn)的搭配形式,從句主語she是第三人稱單數(shù),謂語動詞要用第三人稱單數(shù)形式,go的單三形式是goes,這里是表示肯定的含義。故選B。17.A【解析】句意:只要我們繼續(xù)齊心協(xié)力,我們就會繼續(xù)贏得比賽。考查狀語從句。As long as只要;Even though盡管;As soon as一……就……;Because因?yàn)椤8鶕?jù)語境可知,空格處應(yīng)填意為“只要”的連詞,指的是只要繼續(xù)努力,就能繼續(xù)贏得比賽。故選A。18.C【解析】句意:——你知道他是否愿意和我們一起踢足球嗎?——我想如果他明天有空,他會來的。考查賓語從句和條件狀語從句的時態(tài)。空格1是賓語從句,根據(jù)賓語從句“主現(xiàn)從不限”的原則,由語境可知,此處用一般將來時;空格2是條件狀語從句,根據(jù)條件狀語從句“主將從現(xiàn)”的原 則,可知此處用一般現(xiàn)在時;故選C。19.B【解析】句意:如果大家都盡力而為,每個人都可能機(jī)會成功。考查連詞辨析。before在……之前;if如果;when當(dāng)……時;because因?yàn)椤8鶕?jù)“Everyone may have a chance to be successful...everyone tries his best.”可知,此處表示“如果”大家都盡力而為,每個人都可能有成功的機(jī)會。故選B。20.C【解析】句意:除非你快點(diǎn),否則你會錯過巴士。考查連詞辨析。if如果;or或者;unless除非;so因此。根據(jù)“You will miss the bus …you hurry up”可知,除非快一些,否則就要錯過巴士,用unless引導(dǎo)條件狀語從句,故選C。21.C【解析】句意:即使我們學(xué)某樣?xùn)|西學(xué)得很好,除非我們用它,否則我們會忘記它。考查連詞辨析。while當(dāng)……時;until直到;unless除非;when當(dāng)……時。根據(jù)“we will forget it… we use it”可知,除非我們用所學(xué)的知識,否則很快就會忘記它,用unless引導(dǎo)條件狀語從句,故選C。22.A【解析】句意:如果我去公園,我今天就不會完成作業(yè)。我媽媽會生氣的。考查if引導(dǎo)條件狀語從句。根據(jù)英語語法,if引導(dǎo)的條件狀語從句遵循“主將從現(xiàn)”原則,主句的時態(tài)是一般將來時,從句要用一般現(xiàn)在時。故第一空應(yīng)用一般現(xiàn)在時,第二空應(yīng)用一般將來時,且根據(jù)句意可知,如果去公園,就不會完成作業(yè)了,故選A。23.C【解析】句意:——我可以去閱覽室嗎?——你不能除非你有學(xué)生卡。它只限于學(xué)生用。考查連詞詞義辨析。if如果,引導(dǎo)條件狀語從句;because因?yàn)椋龑?dǎo)原因狀語從句;unless除非,引導(dǎo)條件狀語從句;though盡管,引導(dǎo)讓步狀語從句。分析語境可知是條件狀語從句,空處表示“除非”。故選C。24.C【解析】句意:鮑勃許諾要參加足球比賽,如果他不必在農(nóng)場幫他父母的話。考查連詞。if如果;as因?yàn)椋籾nless如果不,除非; whether是否。根據(jù)“he has to help his parents on the farm”可知表示條件“如果他不必在農(nóng)場幫他父母的話”,用連詞unless相當(dāng)于if not。故選C。25.C【解析】句意:她說,除非生意好轉(zhuǎn),否則她將不得不關(guān)閉餐廳。考查從屬連詞。if 如果;after 在……之后;unless 除非;when 當(dāng)……時候。根據(jù) business improves和she'll have to close the restaurant可知“生意好轉(zhuǎn)”與“她將不得不關(guān)閉餐廳。”是條件關(guān)系,應(yīng)是“除非”。故選C。26.D【解析】句意:除非你非常勤奮和專注地學(xué)習(xí),否則你不太可能通過考試。考查連詞辨析。as因?yàn)椋籦ecause因?yàn)椋籭f如果;unless除非。根據(jù)“You are unlikely to pass the exam”和“you study with great diligence and focus.”可知,此處表示除非你努力,否則無法通過考試,用unless引導(dǎo)條件狀語從句。故選D。27.A【解析】句意:——我妹妹不打算吃很多漢堡包。——如果她做到了,她會減肥的。考查動詞時態(tài)。這里的If引導(dǎo)條件狀語從句,主句用一般將來時,從句用一般現(xiàn)在時,排除C、D;“她這樣做了”是“她會減肥的”的條件,主語she為第三人稱單數(shù),謂語動詞應(yīng)該用第三人稱單數(shù)。故選A。28.B【解析】如果:生活就像是一面鏡子。如果你對著它微笑,它也會對你微笑。考查if引導(dǎo)的條件狀語從句。If引導(dǎo)的條件狀語從句遵循“主將從現(xiàn)”原則,即主句和從句如果要表將來,主句要用一般將來時,從句用一般現(xiàn)在時。空格處于主句位置,用一般將來時。故選B。29.B【解析】句意:如果你舉起某物,你就會把它舉得更高。考查動詞辨析及時態(tài)。rise意為“升起”,不及物動詞,指自然地上漲;raise意為“提高”,及物動詞,表示人為地提高。根據(jù)“you move it higher.”可知,應(yīng)是指人為升高。且主句時態(tài)為一般現(xiàn)在時,從句根據(jù)語境也應(yīng)用一般現(xiàn)在時。故選B。30.A【解析】句意:——你認(rèn)為她把你桌上的書拿走了嗎?——除非我弄錯了。考查從句。根據(jù)“she has taken the book on your table”可知,此句是賓語從句,從句不缺少成分,用that引導(dǎo)賓語從句;再者根據(jù)“I’m mistaken”可知,此句是上句的否定條件,用unless引導(dǎo)條件狀語從句,故選A。31.C【解析】句意:除非你盡力,否則你永遠(yuǎn)不會知道自己有多優(yōu)秀。考查從屬連詞詞義辨析。since自從;though盡管;unless除非;because因?yàn)椤8鶕?jù)“You will never know how great you are”和“you try your best”可知,是指除非你盡力,否則你永遠(yuǎn)不會知道自己有多優(yōu)秀,故選C。32.B【解析】句意:在美國,除非你被邀請,否則你是不應(yīng)該參加一個家庭聚會的。考查一般現(xiàn)在時的被動語態(tài)。設(shè)空處所在的句子是unless引導(dǎo)的條件狀語從句,從句用一般現(xiàn)在時表將來,主語you是動作invite的承受者,表示“被邀請”所以用被動語態(tài),一般現(xiàn)在時被動語態(tài)的構(gòu)成是:主語+am/is/are+動詞的過去分詞,主語是you,be動詞用are,invite的過去分詞是invited,故選B。33.B【解析】句意:除非你努力,否則你不會成功。考查連詞辨析。Because因?yàn)椋籙nless除非;If如果;When當(dāng)……時候。根據(jù)“…you try, you will never succeed.”可知,此處指的是“除非你努力”,應(yīng)該用unless引導(dǎo)條件狀語從句。故選B。34.A【解析】句意:只要我們足夠細(xì)心,我們就會少犯錯誤。考查連詞辨析。as long as只要;so that以便;as far as直到;even if盡管。空前講“我們將會犯更少錯誤”,空后講“我們足夠細(xì)心”,細(xì)心是少犯錯誤的條件,結(jié)合選項(xiàng)可知要用as long as引導(dǎo)條件狀語從句。故選A。35.D【解析】句意:如果天晴了,雪會融化地很快。考查時態(tài)。根據(jù)“if it is sunny.”可知,本題為if引導(dǎo)的條件狀語從句,表示“如果天晴,雪會融化地很快”。if引導(dǎo)的條件狀語從句,遵循主將從現(xiàn)原則。故選D。36.D【解析】句意:如果我有時間,我會和你談?wù)劇?br/>考查時態(tài)。“If I have time”是一般現(xiàn)在時,根據(jù)if引導(dǎo)的條件狀語從句“主將從現(xiàn)”的原則,可知此處填一般將來時,其結(jié)構(gòu)為“am/is/are+動詞原形”或“will+動詞原形”。故選D。37.B【解析】句意:我不知道明天是否下雪。如果下雪,我們將一起待在家里。考查條件狀語從句和賓語從句。空一處句子為賓語從句,主句是一般現(xiàn)在時,根據(jù)“主現(xiàn)從不限”原則及“tomorrow”可知,空一處應(yīng)該用一般將來時,故排除選項(xiàng)A和C;空二處句子是if引導(dǎo)的條件狀語從句,從句用一般現(xiàn)在時表將來時,主語是it,所以動詞用三單形式。故選B。38.A【解析】句意:——我學(xué)業(yè)不擅長。我該怎么辦?——只要你努力,沒有什么是不可能的。考查連詞辨析。as long as只要;as soon as一……就……;as far as遠(yuǎn)至……,就……而言。根據(jù)“you work hard”可知,只要努力,沒有什么是不可能的,應(yīng)用as long as引導(dǎo)條件狀語從句。故選A。39.C【解析】句意:——這周末你想要幫我打掃房子嗎?——如果我寫完作業(yè),我就幫。考查條件狀語從句。before在……之前;though盡管;if如果;so所以。后句是前句的肯定條件,即如果寫完作業(yè),就幫忙,用if引導(dǎo)條件狀語從句。故選C。40.A【解析】句意:如果你早睡,早上你就不會覺得累了。考查時態(tài)。根據(jù)if可知,該句是條件狀語從句,時態(tài)上要遵循“主將從現(xiàn)”,所以從句應(yīng)用一般現(xiàn)在時,從句主語是you,動詞用原形,故選A。41.B【解析】句意:如果不下雨,我們就不會推遲運(yùn)動會。考查從屬連詞辨析。if如果;unless除非;as soon as 一……就……;so that以便于。根據(jù)“我們不會推遲運(yùn)動會”可推測,條件是不會下雨,用unless,相當(dāng)于if not。故選B。42.A【解析】句意:如果你來參加我的聚會,我會很開心的。考查連詞的用法。if如果;though盡管;or或者,否則;and和;分析前后句可知,兩句之間是條件假設(shè)關(guān)系,應(yīng)用if引導(dǎo)條件狀語從句,故選A。43.D【解析】句意:真熱的一天呀!食物將很快變質(zhì),除非我們把它放在冰箱。考查連詞辨析。before在……之前;although盡管;while當(dāng)……時候;unless除非。根據(jù)“we put it into the fridge.”可知空后表示否定的條件,用unless引導(dǎo)條件狀語從句。故選D。44.D【解析】句意:我不知道他明天會不會來,如果來了,我就會告訴你.考查賓語從句和狀語從句。根據(jù)情境可知,第一空前know后引導(dǎo)賓語從句,用if或whether作為引導(dǎo)詞,表示“是否”;第二句是條件狀語從句,用if表示“如果”,故選D。45.A【解析】句意:我們生活在一個快速發(fā)展的世界里,除非我們不斷學(xué)習(xí),否則我們將被落在后面。考查連詞辨析。unless除非;if如果;after在……之后;though雖然。“we keep learning”是“we will be left behind”的否定條件,用unless引導(dǎo)條件狀語從句。故選A。46.D【解析】句意:如果你想了解更多的南京的文化,你最好在當(dāng)?shù)貙?dǎo)游帶領(lǐng)下在南京四處轉(zhuǎn)轉(zhuǎn)。考查連詞辨析。unless 除非,引導(dǎo)條件狀語從句,相當(dāng)于if... not;until直到……為止,引導(dǎo)時間狀語從句;although盡管,引導(dǎo)讓步狀語從句;if如果,引導(dǎo)條件狀語從句。根據(jù)“You’d better travel around Nanjing with a local tour guide”和“you want to know more about its culture.”可知,后一句是前一句的條件,故要用if,故選D。47.B【解析】句意:學(xué)生可能會很快忘記他們所學(xué)的東西,除非他們更經(jīng)常地使用它。考查從屬連詞詞義辨析。if如果;unless除非,引導(dǎo)條件狀語從句;although盡管,引導(dǎo)讓步狀語從句;because因?yàn)椋龑?dǎo)原因狀語從句。根據(jù)“Students may forget what they learn quickly”可知,此處應(yīng)該表達(dá)除非他們更經(jīng)常地使用它,unless“除非”。故選B。48.B【解析】句意:在中國,如果你遇到麻煩,你可以打110向警察求助。考查連詞辨析。although盡管;if如果;before在……之前;so因此。 根據(jù)“you can call 110 and ask the police for help … you get into trouble”可知,此處應(yīng)指如果遇到麻煩可以向110求助,因此應(yīng)用if引導(dǎo)條件狀語從句。故選B。49.D【解析】句意:除非你完成所有的任務(wù),否則你不會得到特別的禮物。考查連詞辨析。after在……之后;because因?yàn)椋粀hile當(dāng)……時。unless除非。根據(jù)“You will not get the special gift … you finish all the tasks.”可知,本句是unless引導(dǎo)的條件狀語從句,表示“除非”。故選D。50.A【解析】句意:如果你知道答案,請舉手。考查連詞辨析。if如果;until直到;before在……以前。根據(jù)“Put your hand up…you know the answer.”的語境可知,此處指舉手的條件是知道答案的情況,應(yīng)用if引導(dǎo)條件狀語從句。故選A。51.A【解析】句意:只有找到工作,我才有足夠的錢上學(xué)。考查條件狀語從句。only if只有……才……;as if好像……;if so如果是這樣,通常用于承接前文,不符合句子的邏輯;if not如果不……。根據(jù)“I will have enough money to go to school...I get a job.”可知,只有找到工作,才有錢上學(xué),應(yīng)用only if引導(dǎo)條件狀語從句,故選A。52.B【解析】句意:如果這個星期六不下雨,我們就去長城。考查連詞辨析。when當(dāng)……時候;if如果;until直到……;because因?yàn)椤8鶕?jù)“We’ll go to the Great Wall”可知,如果不下雨,就去長城,此處是if引導(dǎo)的條件狀語從句。故選B。53.B【解析】句意:露西,如果明天不下雨,我們?nèi)ヂ稜I怎么樣?考查動詞時態(tài)。if引導(dǎo)的條件狀語從句,遵循“主將從現(xiàn)”原則,從句用一般現(xiàn)在時,排除AC選項(xiàng);再結(jié)合語境可知,明天不下雨就去露營。故選B。54.D【解析】句意:我們將要去野餐,除非明天下雨。考查從屬連詞。when當(dāng)……時;if如果;since因?yàn)椋籾nless除非。主句“We will go for a picnic”意為“我們將要去野餐”,從句“it rains tomorrow”意為“明天下雨”,想要達(dá)成主句的結(jié)果需要不滿足從句的條件。故選D。55.D【解析】句意:如果明天不下雨,我將和同學(xué)們一起去旅行。考查時態(tài)。根據(jù)“If it…tomorrow”可知,句子是if引導(dǎo)的條件狀語從句,遵循“主將從現(xiàn)”原則,即主句用一般將來時,從句用一般現(xiàn)在時。從句主語it為第三人稱單數(shù),謂語動詞用doesn’t rain。故選D。56.A【解析】句意:我不知道明天是不是晴天。如果天氣晴朗,我就去釣魚。考查動詞時態(tài)。第一句是由if引導(dǎo)的賓語從句,主句時態(tài)為一般現(xiàn)在時,又根據(jù)“tomorrow”可知,賓語從句應(yīng)用一般將來時,其結(jié)構(gòu)為“will be”;第二句是由if引導(dǎo)的條件狀語從句,應(yīng)遵循“主將從現(xiàn)”原則,從句應(yīng)用一般現(xiàn)在時,且從句主語it表示單數(shù)概念,謂語動詞應(yīng)用is。故選A。57.B【解析】句意:除非我感到累,否則我會把這本書看完。考查連詞辨析。if如果;unless除非;until直到;because因?yàn)椤8鶕?jù)“I will finish the book…I feel tired.”可知,此處指否定條件,除非很累,否則會完成,應(yīng)該用unless引導(dǎo)條件狀語從句。故選B。58.C【解析】句意:——你嬸嬸早晨經(jīng)常在南湖公園鍛煉嗎?——是的,除非惡劣的天氣阻擋著她。考查從屬連詞辨析。as當(dāng)……時候;because因?yàn)椋籾nless除非。根據(jù)上文“Does your aunt often exercise in the South Lake Park in the morning ”以及答語“Yes, …bad weather stops her.”可知,“bad weather stops her”是上句的否定條件,用unless連接,表達(dá)除非壞天氣阻止了她。故選C。59.B【解析】句意:如果我們?yōu)閼烟嘏颗e辦一個驚喜聚會,她會很高興的。考查連詞辨析。as當(dāng)……時候;if如果;or否則;until直到。根據(jù)題干分析可知,后句是前句的肯定條件,應(yīng)用if引導(dǎo)條件狀語從句。故選B。60.A【解析】句意:如果你去敬老院,你會做什么?考查If引導(dǎo)的條件狀語從句。本句是if引導(dǎo)的條件狀語從句,主句用一般將來時,從句是一般現(xiàn)在時,主語是you,因此動詞為原形go。故選A。61.A【解析】句意:——如果你上網(wǎng)課,不要忘記保護(hù)好你的眼睛。——好的,謝謝您,先生。考查連詞辨析。if如果;or否則;so所以;till直到。分析題干可知,“you take online classes”是前句的條件,應(yīng)用連詞if引導(dǎo)條件狀語從句。故選A。62.B【解析】句意:如果這個機(jī)器人壞了,你可以免費(fèi)換一個新的,或者全額退款。考查動詞時態(tài)。根據(jù)語境可知,這是商家的一種承諾,主句表達(dá)的是將來的事實(shí)。空處在if引導(dǎo)的條件狀語從句中,應(yīng)用一般現(xiàn)在時。故選B。63.A【解析】句意:我想知道是否明天他有時間。如果他有空,我會邀請他在我們學(xué)校演講。考查動詞的時態(tài)。動詞“wonder”后是“if ”引導(dǎo)賓語從句,表達(dá)“是否明天他有時間”,根據(jù)“tomorrow” 可知從句是一般將來時,動詞用“will have”。后半句是“if”引導(dǎo)的條件狀語從句,主句用一般將來時,從句是一般現(xiàn)在時表示將來,表達(dá)“如果他有空”,be動詞用“is”。故選A。64.B【解析】句意:除非親眼所見,否則我們是不會相信的。考查連詞。because因?yàn)椋籾nless除非;if如果;after在……之后。根據(jù)語境可知,此處應(yīng)用連詞unless引導(dǎo)條件狀語從句,故選B。65.D【解析】句意:如果她問我,我就告訴她答案。考查條件狀語從句。tell告訴;ask詢問。根據(jù)句意可知if意為“如果”,所以本句為if引導(dǎo)的條件狀語從句,結(jié)合主將從現(xiàn)原則可知,主句用一般將來時,從句用一般現(xiàn)在時。故選D。66.D【解析】句意:如果彼得今晚沒有時間,他就不會來參加我們的聚會了。考查If引導(dǎo)的條件狀語從句。本題是If引導(dǎo)的條件狀語從句,遵循主將從現(xiàn)的原則。從句主語“Peter”是第三人稱單數(shù),因此助動詞是doesn’t,其后動詞為原形;主句是一般將來時,結(jié)構(gòu)是will do,will的否定形式是will not,縮寫為won’t。故選D。67.B【解析】句意:只要我們不在困境中失去希望,我們的夢想就會實(shí)現(xiàn)。考查連詞辨析。though盡管;as long as只要;because因?yàn)椋籹o所以。根據(jù)“Our dreams will come true ...we don’t lose hope in trouble.”可知前后是條件關(guān)系,應(yīng)用as long as引導(dǎo)條件狀語從句,故選B。68.A【解析】句意:我們不能確定明天是否將要下雨。如果下雨的話,我們將不去爬南山。考查動詞時態(tài)。分析句子結(jié)構(gòu)可知,第一個空格處是if引導(dǎo)的賓語從句;再者根據(jù)“tomorrow”可知,動詞要用一般將來時will rain;第二個空格處是if引導(dǎo)的條件狀語從句,主句用一般將來時,從句要用一般現(xiàn)在時,且從句主語是第三人稱單數(shù),因此rains符合句意。故選A。21世紀(jì)教育網(wǎng)(www.21cnjy.com)21世紀(jì)教育網(wǎng)(www.21cnjy.com) 展開更多...... 收起↑ 資源預(yù)覽 縮略圖、資源來源于二一教育資源庫