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肯定句变否定句的技巧
一、动词后直接加not。原句中含有be动词(am, is, are, was, were) 和助动词(have, has, had) 和情态动词(can, shall, will, may, should, would, might, had better等)时，要在动词后直接加not。如：
His mother has already called the police for help.
His mother ______ called the police for help ______. (答案：hasn’t, yet)
二、原句中没有be动词，助动词或情态动词时，要在行为动词前加助动词(do, does, did)与否定副词not的缩写形式。另外，还需要将原句子中的some改为any; too改either;already改为yet。还需要分清do, have等是实义动词还是助动词。如(from zkenglish.com)：
The old man hurt his leg last Wednesday.
The old man ______ ______ his leg last Wednesday. (答案：didn’t hurt)
三、原句中含有every, everything, all, both等不定代词或both…and…, a lot of 等短语时，与否定副词not连用属部分否定。把这些不定代词变成neither, none, no one或把both…and…变成neither…nor…时，才是全部否定。如：
Both Joy and Sam like singing Beijing Opera.
______ Joy ______ Sam likes singing Beijing Opera.(答案：Neither, nor)
四、在含有宾语从句的主从复合句中，当主句的主语是第一人称，谓语动词是think时，如果要否定后面的宾语从句，习惯上否定主句的谓语动词。如：
I think she will come here soon. →I don’t think she will come here soon.
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