①如果句子中含有be动词、助动词(像can could would)直接在be动词或助动词后面加not.
如I can cook. 变成否定句I can’t cook (can’t=can+not)
②如果句子中含有实意动词(像run swim eat )要在动词前加don’t(主语是第三人称单数要加doesn’t)
如I go to school变成否定句 I don’t go to school
He plays football 变成否定句He doesn’t play football
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