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.