單元語法聚焦Grammar語法精講before,after和as引導(dǎo)的時(shí)間狀語從句連詞用法例句位置注意before（在……以前）當(dāng)其引導(dǎo)的時(shí)間狀語從句位于句首時(shí)，常用逗號與主句隔開；位于句末時(shí)，不用逗號與主句隔開。表示主句的動(dòng)作發(fā)生在從句Hereadsforhalfanhourbeforehegoestobed.after（在……以后）表示主句的動(dòng)作發(fā)生在從句的動(dòng)作之后Hewilltellusaboutitafterheesback.as（一邊……一邊；當(dāng)……的時(shí)候；隨著）多表示從句的動(dòng)作與主句的動(dòng)作同時(shí)發(fā)生。從句中的謂語動(dòng)詞可以是延續(xù)性的，也可以是非延續(xù)性的IthoughtaboutitasIwalkedtoschool.Astimewentby,hegrewintoabraveman.who和that引導(dǎo)的定語從句關(guān)系代詞用法例句（斜體詞為先行詞）that既可指人也可指物；在定語從句中作主語或賓語，作賓語時(shí)可以省略Thisisthekite(that)Imade.Doyouknowthemanthatisstandingoverthere?who指代人，在定語從句中作主語或賓語，作賓語時(shí)可以省略Everyonewhoknewhimlikedhim.Thegirlwhoissingingnowismysister.語法精練中考考點(diǎn)變式練Ⅰ.語法與情景對話1.Youdbettermakeagoodplan____youtakeaholiday.A.duringB.afterC.asD.before2.Doyouknowthegirl____isdrawingapicture?A.whomB.whoseC.whichD.who3.(2025溫州永嘉期中改編)Ifeltawful____thedoctorwascheckingmyheart.A.asB.whileC.thoughD.if4.航天事業(yè)Thescientistsaredoingthefinaltest____theylaunchtherocket.A.afterB.beforeC.asD.when5.Johnfeltbetter____hetookthemedicine.A.ifB.unlessC.untilD.after6.Therearefewerplacesfortheanimalstolivein____peoplecutdownsomanytrees.A.afterB.beforeC.untilD.when7.(2025成都武侯一模)Tomakepapercutting,weneedtofoldthepaper____itiscutwithscissors.A.beforeB.soC.afterD.during8.Youcanspendtimewithyourfriends____youplaysportstogether.A.asB.soC.butD.either9.(2025吉林模擬預(yù)測)Thisisthemostinterestingbook____Ihaveeverread.A.whichB.thatC.whatD.who10.—Thegirl____wonthefirstprizeisfromourclass.—Really?Imsoproudofher.A.whichB.whoC.whoseD.whomⅡ.句型轉(zhuǎn)換11.Hedidntgotobeduntilhisfathercameback.（改為同義句）Hewenttobed______hisfathercameback.12.Jackisayoungsinger.Hewantstomakeprogressinsinging.（合并為一句）Jackisayoungsinger_______wantstomakeprogressinsinging.13.Tomdidntgotobeduntilhefinishedhiswork.（改為同義句）Tom_______tobed________hefinishedhiswork.14.Hesignedthelastletter.Hepassedaway.（合并為一句）Hesignedthelastletter_________hepassedaway.15.IhaddinnerafterIcamehome.（改為同義句）I________havedinner________Icamehome.情境小練/周末農(nóng)場體驗(yàn)日九年級（3）班的學(xué)生參加學(xué)校組織的農(nóng)場勞動(dòng)體驗(yàn)活動(dòng)。情境1出發(fā)前，九年級（3）班的同學(xué)們集合在操場，老師給大家講解注意事項(xiàng)。Ⅰ.用before,after,as填空1.Checkyourbagforwaterbottles____yougetonthebus,orthedriverwontletyouopenitlater.2.Welleatlunch____wefinishplantingallthevegetables,sowecaneatwithoutworryingaboutwork.3._________themorningsunriseshigherinthesky,thetemperatureincreasesquickly.4.Washyourhandscarefully_________youtouchanyfruits,tokeepthemcleanandsafe.5.Theshysheepwillonlyeclosetous__________weofferthemfood.情境2到達(dá)農(nóng)場后，農(nóng)場工作人員給大家講解勞動(dòng)規(guī)則。Ⅱ.區(qū)分that或who的用法6.Thegloves__________weprovideprotectyourhandsfromthorns(刺).7.Theworker__________iswearingahatwillteachyoutofeedgoats.8.Thevegetables__________growinthisfieldarehealthy.9.Thechickens_________livenearthebarn(谷倉)layfresheggseveryday.10.Thefarmer_________ownsthisfarmstartedworkingatage15.情境3Danny在農(nóng)場活動(dòng)體驗(yàn)結(jié)束后寫了一篇日記。Ⅲ.Danny不小心把墨水滴在日記本上了，請將墨水污染處的內(nèi)容補(bǔ)充完整FarmWorkDiarySaturday,May20thSunnyTodaywasourfarmworkday!Thesheepfollowedme11._________Ifedthem—theyweresofriendly!12.__________thesunrosehigher,theweathergothotter.Theboy13.__________woreastrawhatdugthemostpotatoes—hewasreallystrong!14.___________wehadlunch,werestedforhalfanhour.Bytheway,theshovel(鏟)15._________Iusedwasboughtbymydadlastyear.Itwasatiringbutfunday!答案解析Ⅰ.語法與情景對話1.答案：D。在度假之前最好制定一個(gè)好計(jì)劃，before“在……之前”符合語境。during表示“在……期間”；after“在……之后”；as“當(dāng)……時(shí)候；一邊……一邊；隨著”。2.答案：D。先行詞是thegirl（人），且在從句中作主語，所以用關(guān)系代詞who。whom在從句中作賓語；whose表示所屬關(guān)系“……的”；which用于指物。3.答案：A。當(dāng)醫(yī)生檢查心臟時(shí)感覺很糟糕，as引導(dǎo)時(shí)間狀語從句，強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)進(jìn)行，可譯為“當(dāng)……時(shí)候”。while引導(dǎo)的從句中謂語動(dòng)詞通常是延續(xù)性動(dòng)詞；though“盡管”引導(dǎo)讓步狀語從句；if“如果”引導(dǎo)條件狀語從句。4.答案：B?？茖W(xué)家在發(fā)射火箭之前做最后的測試，before“在……之前”。after“在……之后”；as“當(dāng)……時(shí)候；一邊……一邊；隨著”；when“當(dāng)……時(shí)候”。5.答案：D。約翰吃完藥后感覺好多了，after“在……之后”。if“如果”；unless“除非”；until“直到”。6.答案：A。人們砍伐了很多樹之后，動(dòng)物的生存空間就變少了，after“在……之后”。before“在……之前”；until“直到”；when“當(dāng)……時(shí)候”。7.答案：A。剪紙前需要先折紙，before“在……之前”。so“所以”；after“在……之后”；during“在……期間”。8.答案：A。當(dāng)一起做運(yùn)動(dòng)時(shí)可以和朋友共度時(shí)光，as“當(dāng)……時(shí)候”。so“所以”；but“但是”；either“也（用于否定句）；兩者中的任何一個(gè)”。9.答案：B。先行詞book前有最高級themostinteresting修飾，關(guān)系代詞只能用that。which指物，但在這種情況下不用；what不能引導(dǎo)定語從句；who指人。10.答案：B。先行詞是thegirl（人），在從句中作主語，用who。which指物；whose表示所屬關(guān)系“……的”；whom在從句中作賓語。Ⅱ.句型轉(zhuǎn)換11.答案：after。原句“直到父親回來他才睡覺”，同義句“父親回來后他睡覺了”。12.答案：who/that。先行詞是singer（人），在從句中作主語，用who或that引導(dǎo)定語從句。13.答案：went;after。原句“直到完成工作湯姆才睡覺”，同義句“湯姆完成工作后去睡覺了”，注意時(shí)態(tài)為一般過去時(shí)。14.答案：before。他在去世前簽署了最后一封信，before引導(dǎo)時(shí)間狀語從句。15.答案：didn't;until。原句“回家后吃晚餐”，同義句“直到回家才吃晚餐”。情境小練情境11.答案：before。上車前檢查書包里的水瓶。2.答案：after。種完所有蔬菜后吃午飯。3.答案：As。隨著早晨太陽在天空中升高，氣溫快速上升，as“隨著”。4.答案：before。摸水果前仔細(xì)洗手。5.答案：after。害羞的羊在我們給它們食物后才會靠近。情境26.答案：that。先行詞gloves（物），在從句中作賓語，用that引導(dǎo)定語從句，可省略。7.答案：who/that。先行詞worker（人），在從句中作主語，用who或that引導(dǎo)定語從句。8.答案：that。先行詞vegetables（物），在從句中作主語，用that引導(dǎo)定語從句。9.答案：that。先行詞chickens（物）