非谓语动词过去分词(done)动词不定式todo现在分词/动名词(doing)

todoforms1(subject)2(object)3(predicative)4(attribute)5(adverbial)6(objectcomplement)1一般式2进行式3完成式形式主动被动一般式进行式／完成式functionstodotobedonetobedoingtohavedonetohavebeendone

??二、不定式句法功能1)三情况：直接作主语：Tolearnaforeignlanguageisveryimportantforus.It作形式主语：Itisimportanttokeepourenvironmentclean.具体动作：不定式作主语时，可以表示具体的动作或计划。Totravelaroundtheworldhasalwaysbeenmydream.Tohelpothersisagoodhabit1.不定式作主语(subject)

2).常考句型It+be+adj.+for/ofsb.todosth.★for:adj.多为描述不定式行为的特征,特点（important/necessary/interesting等.）★of:adj.多为描述主语的品质（kind/nice/friendly/wise/foolish等.）Practice:1.Itisvital______ustolivealow-carbonlife.2.Itisbravehimtofacethechallenge.forof

1）动词+todoShedecidedtotheparty.decide/determine,learn,manage,tryrefuse,promise,pretend,agreewant,help,choose,planhope/wish/expect,offer,waithappen,fail,afford2）不定式有时和wh-词构成宾语.①下一步干什么你决定了吗?Haveyoudecided____________next?②我不知道怎么做它。Ididn’tknow______________it.whattodohowtodo决定学好，（就）设法努力拒绝承诺；（就）假装同意；想要帮忙，（就）选好计划希望关心；（就）主动等待碰巧威胁，（也）不能付钱2.不定式作宾语(object)nottogo

3)动词+it+宾补+todo此时，it是形式宾语，真正的宾语是后面的todo不定式常用动词：make,find,feel,think,believe,consider?当it后面是nouse或nogood时，todo应改为doing（1）IthinkitimportanttolearnEnglishwell.（2）Shefounditdifficulttofinishthetaskontime.（3）Heconsidersitnecessarytotakeabreak.（4)Theyfeeliturgenttosolvetheproblem.(5)Ifinditnousestartingthediscussion.

不定式作表语多表示某一次具体的、特定的或将来的动作。MydreamistoenterBeijingUniversity.主语是以aim,duty,hope,idea,intention,plan,proposal,suggestion等为中心词的名词词组,表语用不定式说明其内容Myideais___________(climb)themountainfromthenorth.Mysuggestionis_____________(start)workatonce.toclimbtostart3.不定式作表语(predictive)

定语是用来描述名词的品质与特征的修饰语，它常和名词构成名词短语。1)不定式作定语通常放在所