2021年大学英语四级考试必备语法知识点思维导图

1)现在完成进行时态(have/hasbeen+-ing分词构成):动作或状态从过去某时开始,继续到现在,可能继续下去,也可能刚刚结束.

2)过去完成进行时(由hadbeen+ing分词构成):过去某个时刻以前一直在进行的动作

3)将来完成进行时:将来某个时刻以前一直在进行的动作.

4)将来完成时(由shall/willhave+过去分词构成):将来某时已发生的事.

可以有两种被动结构的类型,例如:

Hewassaidtobejealousofhersuccess.

Itwassaidthathewasjealousofhersuccess.

能同时适用于上述两个句型的主动词通常都是表示“估计”,“相信”等意义的动词,常见的有assume,believe,expect,fear,feel,know,presume,report,say,suppose,understand等.

Itissupposedthattheshiphasbeensunk.

Theshipissupposedtohavebeensunk.

担当besupposedto与不定式的一般形式搭配时往往表示不同的意义.例如:

Whyareyoudrivingsofastinthisarea?Youaresupposedtoknowthespeedtoknowthespeedlimit.(你应该晓得速度限制)

双宾语及宾补结构的被动语态

双宾语结构的被动语态:双宾语结构变为被动语态时,可以把主动结构中的一个宾语变为主语,另一个宾语仍然保留在谓语后面,但多数是把间接宾语变为主语.

Hewasaskedanumberofquestionsatthepressconference.

Twodayswereallowedthemformakingthenecessarypreparations.

宾补结构的被动语态:

ShewascalledBigSisterbyeverybody.

Thenhewasmadeasquadleader.

Hewasconsideredquitequalifiedforthejob.

Theroomwasalwayskeptcleanandtidy.

Vi+adv

Theplanetookofftwohourslate.

Vi+prep

TheylookedroundtheCathedral.

Vi+prep(有被动语态)

She’slookingafterhersister’schildren.

Thechildrenwerealwayswelllookedafter.

Vi+adv+prep

Ibegantolookforwardtotheirvisits.

Vt+O+adv

Somewomenchoosetostayathomeandbringuptheirchildren.

Thechildrenwerebroughtupbytheirmother.

Theytookhimon.

Vt+adv+O(无被动语态)

Iamtryingtogiveupsmoking.

Vt+O+prep

WetalkedDonaldintoagreement.

在以as,than,when,if,unless等引导的从句中的省略:

在有些状语从句中,如果谓语包含有动词be,主语又和主句的主语一致a),或者主语是itb),就常常可以把从句中的主语和谓语的一部分(特别是动词be)省略掉.

Lookoutforcarswhencrossingthestreet.

Whentakenaccordingtothedirections,thedrughasnosideeffects.

Whiletherehejoinedinvoluntarylabouronaproject.

Althoughnotyetsixmonthsold,shewasabletowalkwithoutsupport.

Ifnotwellmanaged,irrigationcanbeharmful.

Thoughreducedinnumbers,theygainedinfightingcapacity.

Thisviewpoint,howeverunderstandable,iswrong.

Enemies,oncediscovered,weretightlyencircledandcompletelywipedout.

Shehurriedlylefttheroomasthough/ifangry.

Sheworkedextremelyhardthoughstillratherpoorinhealth.

Fillintheapplicationasinstructed.

Wheneverknown,suchfactsshouldbereported.

Thedocumentswillbereturnedassoonassigned.

Hesaidthatnoacrobatcouldeverperformthosedaringfeatsunlesstrainedveryyoung.

Oncehavingmadeapromise,youshouldkeepit.

IfnecessaryI’llhavetheletterduplicated.

Fillintheblankswitharticleswhere(ver)necessary.

Ifpossible,Ishouldliketohavetwocopiesofit.

Asscheduled,theymetonJanuary20attheChineseEmbassy.

在以thana)或asb)引起的从句中,常会有一些成分省略.

Hetoldmenottousemorematerialthan(itis)necessary.

Weshouldthinkmoreofthecollectivethanofourselves.

Theyworkedwithasmuchenthusiasmasyoungpeople(did).

Heisnowavice-manager,butstilloftenworksinthekitchenasbefore.

Theirtrainingisfree,asisalleducation.

Wewill,asalways,standonyourside.

HislifeisasfullycommittedtobooksasanyoneIknow.

Whilestandingthereinhernightgown,twobulletsstruckthewallbesideher.

如果主语是单数,尽管后面跟有with,togetherwith,aswellas,asmuchas,nolessthan,morethan等引导的短语,谓语动词仍旧用单数形式.

Terry,alongwithherfriend,goesskatingeverySaturday.

Anexpert,togetherwithsomeassistants,wassenttohelpinthiswork.

Thecaptain,aswellasthecoaches,wasdisappointedintheteam.