初一英语（上）知识点：助动词的用法

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助动词(do, does )的用法

只有实意动词作谓语时才涉及使用助动词。以like为例:

1)当句子为肯定句时不涉及使用助动词,只涉及"主谓一致"原则。

eg : I like English a lot.

Michael likes Chinese food very much.

2)当句子为否定句时,要根据主语的人称来决定使用相应的助动词:当主语为"三单"时,要使用does;当主语为"非三单"时,用助动词原形do。例如把下列句子变否定句:

Kangkang likes math.----Kangkang doesn't like math.

They like sports.------They don't like sports.

3)当句子变疑问句时,同样要根据句子的主语来决定在句首使用Do或Does.例如下列句子变问句:

Michael likes Chinese Food.----Does Michael like Chinese food? Yes, he does./ No, he doesn't.

Jane and Helen like music.----Do Jand and Helen like music? Yes, they do./ No, they don't.