英语、、、英语中的肯定句变否定句的规则

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英语、、、英语中的肯定句变否定句的规则

1.在一般现在时和一般过去时中,1)在be后加not.He is here.否定:He isn't here They were very happy.否定:They weren't very happy如动词是其它的实意动词:2)如是动词原形则在前加助动词do 再加not;They do spor...