He is cleaning his teeth
英文翻译如下
他正在刷牙。
否定句
He is not cleaning his teeth.
这句话是现在进行时，变成否定句只需要加not就可以了，否定句是He isn't cleaning his teeth.
He is cleaning his teeth.的否定句是：He is not cleaning his teeth.
原句为现在进行时，现在进行时的否定句为be动词后跟not，所以其否定句为He is not cleaning his teeth
这个句子是主系表结构，cleaning～是现在分词短语作表语。系语后加not即否定形式：He is not cleaning his teeth.
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