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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