b3m4语法 动词不定式课件.ppt

动词不定式一、构成:一般式:todo否定式:被动式:nottodotobedone()二、用法::(1)表示具体某一次的动作,:-ing表示****惯性、经常性的动作。练****_______(keep)(keep)theofficecleanisherjobthisafternoon.(2)todo做真正的主语,it做形式主语常见结构:Itis+n/adj+(for/ofsb):Itisimpossibleforme___________(finish)(help)(1)下列动词后面加动词不定式作宾语:agree、offer、intend/plan、promise、help、prepare、decide、refuse、choose、wish/hope/want/expect、fail、pretend、manage、determine、beg、threaten、claim、aim、hesitate可加V-ing形式和todo作宾语的动词意义上的区别liketodolikedoingremembertodo记得要去做某事rememberdoing记得做过某事trytodo努力做某事trydoing尝试做某事meantodo打算做某事meandoing意味着做某事stopdoing停止正在做的事stoptodo停下来做另外一件事can’thelpdoing禁不住做某事can’thelptodo不能帮助做某事regretdoing后悔做了某事regrettodo遗憾去做某事(一般构成regrettosay/tell/inform)liketryremembermeanstopcan’thelpregret(2)todo做真正宾语,it充当形式宾语:feel/find/think/consider/makeit+adj+(forsb)todo例句:: people sometimes separate their waste to make it easier for it ______________(reuse). ’thelp__________(clean)theclassroom,(turn)offlampsbeforeIlefttheoffice,ot__________(close)(3)tohave(been)done(不定式的完成式)与tobedoing(不定式的进行式)做宾语:Sheseemedtohavewatchedthemovie,:Havingfinishedhomework,:1.------IsBobstillperforming?------ (read)(treat)(let). The bank is r