动名词和不定式作主语的区别:动名词表一般习惯性,抽象的多次的动作；不定式表示一次性或尚未发生的动作.(有时可互换)Eg:1).TeachingEnglishismyfull-timejob.2).Smokingmeanswastingalotofmoney.3).Gettingupearlyisgoodforourhealth.4).Tosavemoneynowisnoteasy.5).Totalktoheristotalktoawall.注意：1.主语和表语/宾形式保持一致。Eg:1).Seeingisbelieving.=Toseeistobelieve.2).Savingishaving.2.为了保持句子的平衡，采用it作形式主语代todo/doing,常用句型：It’snouse/good/need+doing①It’suseless/worthwhile+doingEg:It’snousewaitinghere.It’snogoodhelpinghim.It’s+adj+forsb+todosth②Eg:It’sdifficultforhimtofinishthehardworkinaweek.3.Thereisno+doing(常用doing作主语)，相当于Itisimpossibletodosth.Eg:Thereisnogettingalongwithhim.4.句中it作形式主语，than前后应构成对等关系。Eg:1).It’seasiertoreadaforeignlanguagethantospeakit.2).Readingaforeignlanguageiseasierthanspeakingit.5.单个动名词作主语时，谓语用单数形式，若有and并列多个动名词作主语时，谓语复数。Eg:Smokinganddrinkingareharmfultoourhealth.
