不定式、动名词、分词、独立主格结构用法之区别
总述：分词短语作定语时相当一个定语从句单个现在分词作定语常前置单个过去分词常后置表一次具体动作而前置表通常状况。非谓语的否定式是把
ot置于非谓语动词前。分词短语作状语时相当于各种状语从句即各种状语从句的主语与主句主语相同去掉连词和从句主语把谓语动词改为非谓语形式当从句主语与主句主语不同时则主语不能去掉即变成独立主格结构但不能作定语和补语。不定式表示过去或将来具体某一次动作强调全过程或表示将要发生的动作。不定式表示一般状况与动名词用法相同。不定式还可做目的状语和结果状语。单个动名词做主语谓语用单数做表语时表示主语的性质或具体内容。一、不定式1、to动原叫做不定式与动名词、分词一起叫做非谓语形式。其复合结构也一样作使役、感观V宾补时不带to而当这些动词变成被动语态时要加上to。省to1helpsbsthto动原、do
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