摘要:在做此类题时.通常在系动词.助动词和情态动词后加not (n't).如果句中没有这些词.则根据谓语动词的原形.第三人称单数动词形式或过去式而分别在其前面加do not , does not 或did not , 并将第三人称单数动词形式或过去式改为原形.如: We can finish the work this afternoon. →We can't finish the work this afternoon. They put the basket under the tree just now. →They didn't put the basket under the tree just now. 注意:1. 当think, believe, suppose等动词后面跟宾语从句时.通常用否定主句谓语动词来达到否定从句谓语动词的目的.如: I think they can come tonight. →I don't think they can come tonight.2. 当must表示推测.表示“一定,肯定 的含义时.否定句应用can't.如: He must be in the room. →He can't be in the room.

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