第 1 页 共 7 页 助动词和情态动词 1、助动词和情态动词的定义: 助动词一般没有词义,主要构成谓语,表示时态、语态或构成疑问及否定形式
情态动词,有词义,但它也和助动词一样,不能单独作谓语,它必须和其他动词一起构成谓语
情态动词没有人称和数的变化,其后必须跟动词原形
判断正误: ( )She cans swim well
( )She can swims well
( )She can swim well
( )She swims well
(1)助动词的种类 ①be(am,is,are,was,were,been,being) 助动词be 与现在分词结合,可以构成进行时态,与过去分词结合可以构成被动语态
I am reading the book
我正在读这本书
The book was written by me
这本书是我写的
②have(has,had,having) 助动词have 与过去分词结合,构成完成时态
I have finished my homework
我已经写完作业了
She has finished her homework
她已经写完作业了
We had finished our homework
我们已经写完作业了
③shall(should),will(would) 助动词shall 和will 与动词结合,构成将来时
I will visit Beijing tomorrow
我明天将到北京参观
We shall be very happy to see you
我们见到你会很高兴的
④do(does,did) 助动词do 与其他动词结合构成否定句和疑问句
I don’t like dogs
Does she clean the room
她打扫房间吗