Youmaytakearestwhenyoufinishdoingyourwork.(主句有情态动词) CouldyoulookaftermysonafterIleavehome? (情态动词could是为了让语气委婉,并不指过去时,从句仍用一般现在时) Iwillgooutassoonasitstopsrainingthisafternoon.(主句是将来时) Waitforyourbrotheratthebusstationuntilhearrives.(主句是祈使句) 2而主句若是一般过去时,从句也要用表过去时的适当时态,如: IwouldgivethemoneytothecharityifIhadamilliondollars. Whenhegottothepark,hisclassmateshadleft. Mysonrantowardsmeassoonashesawmeonthestreet. 3.定语从句:定语从句是指修饰前面名词或代词的句子。从句前面的名词或代词叫先行词,从句中的引导词叫关系代词或关系副词。关系代词who只指人,which只指物。that既可指人又可指物。whose后必须跟有名词,既指人,也可指物。关系词作主语时,不可省略,作宾语时可省略。whom只指人,只作宾语。关系副词where指“在那里”,when指“在那时”。(以下所给例子凡斜体字部分均作定语从句。) Sheisagirlwho/thatisbeautifulandkind-hearted.Thegirlwho/thatistallismysister. (以上关系词作主语,不可省略。) Sheisagirl(who/whom/that)Iknowverywell.(关系词做know的宾语,可以省略。) Thatboywhosehairisverylongismybrother.Iownabikewhosepriceishigh. (关系词whose表所属,后需接名词。前句指人,译为“这个孩子的”;后句指物,译为“这个自行车的”。) (责任编辑:admin) |