1. 若原句中有動詞be
原句中含有be動詞(am, is, are, was, were) 和助動詞(have, has, had) 和情態動詞(can, shall, will, may, should, would, might, had better等)時，要在動詞后直接加not。如
His mother has already called the police for help. (烏魯木齊市中考題)
His mother ________ called the police for help ________. (答案：hasn’t, yet)
2. 若原句中沒有動詞be
原句中沒有be動詞，助動詞或情態動詞時，要在行為動詞前加助動詞(do, does, did)與否定副詞not的縮寫形式。另外，還需要將原句子中的some改為any； too改either；already改為yet。還需要分清do, have等是實義動詞還是助動詞。如
The old man hurt his leg last Wednesday. (西寧市中考題)
The old man ________ ________ his leg last Wednesday. (答案：didn’t hurt)
3. 若原句中有不定代詞
原句中含有every, everything, all, both等不定代詞或both…and…, a lot of 等短語時，與否定副詞not連用屬部分否定。把這些不定代詞變成neither, none, no one或把both…and…變成neither…nor…時，才是全部否定。如
Both Joy and Sam like singing Beijing Opera. (新疆中考題)
________ Joy ________ Sam likes singing Beijing Opera.(答案：Neither, nor)
4. 若原句為復合句
在含有賓語從句的主從復合句中，當主句的主語是第一人稱，謂語動詞是think時，如果要否定后面的賓語從句，習慣上否定主句的謂語動詞。如
I think she will come here soon. →I don’t think she will come here soon.
