2015年成人英语三级助动词复习:助动词的基础用法

更新时间：2015-05-12 14:22:25 来源：|0

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　　助动词的基础用法：

　　助动词有：be, am, is, are, was, were, been, being

　　do, does, did

　　have, has, had

　　shall, will, should, would

助动词	功能及例句
be am, is, are, was, were，been, being	1）帮助构成进行时态。如：He is playing football.他在踢足球。 2）帮助构成被动语态。如：I was cheated.我被骗了。
do does, did	1）帮助实义动词构成否定。如：I do not like Japanese.我不喜欢日语。 2）帮助实义动词构成疑问。如：Do you like English?你喜欢英语吗？
have has, had	帮助构成完成时。如：I have studied English for 2 years.我已经学英语两年了。
shall, will, should, would	帮助构成将来时。如：We shall be there at 10.我们十点到达那里。 should have, would have, should, would可以帮助构成虚拟语气。如：If he were here, everythingwould be all right.如果他在，一切都会好起来。