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2019小升初英语语法陈述句知识点：肯定句变否定句

的基本方法

1. be动词的否定式

be 动词根据不同的人称和时态有不同的形式，在一般现在时中是am ， is ， are可用作联系动词，构成否定式时，一律在其后面加否定词not.

He is reading. --- He is not reading. They are from China. --- They are not from China.

2. 情态动词的否定式

情态动词的否定式是在其后面直接加not. 如：

I can swim. --- I can’t swim. He can dance. --- He

can’t dance. You should go to school at seven. --- You shouldn’t go to school at seven.

3. 实义动词的否定句

实义动词变否定句时，要借助助动词do ， does，在一般现在时

中用do或者does其句子结构为：主语+ don’t / doesn’t + 动词

原形+其它例如：

I like pop music. --- I don’t like pop music. He likes running. --- He doesn’t like running.

She does her homework at home. --- She doesn’t do her homework at home

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