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动词不定式作主语的用法I.动名词和不定式做主语的相同点.不定式短语和动名词做主语时,常常为了保持句子的平衡,用来做形式主语,如1itIt isnot easyto learnEnglish well.It isno useasking himfor help..如果主语用了不定式,表语和宾语也要用不定式;主语用了动名词,表语和宾语也要用动名词,这在英2语中称为对称性,如眼见为实To seeis tobelieve.=Seeing isbelieving.85It isbetter tostay homethan_A_out.A.to goB.going C.go D.gonen.动名词和不定式做主语的不同点.不定式做主语常表示具体的某一动作;表示泛指或一般的抽象的概念时,多用动名词,如192_B_is agood formof exercisefor bothyoung andold.A.The walkB.Walking C.To walkD.Walk〃.在〃之后常用动名词做主语,而少用不定式,如2There/It+be+no usegood/help/needIt/There isno usecrying overthe splitmilk.It/There isno helptaking thismedicine.★但是如果该句型中用了引出不定式的逻辑主语,就只能用不定式,如for93There isno goodfor usto dothat exercise.不定式可以和等连用,在句子中做主语,宾语和表语,而动名词3•when,where,how what,whetherz则不能如How tosolve theproblem isa hotpotato.Where toput thebox seemshard todecide.Whether todo ithasn tbeen decided.What todo nextis upto you.。
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