把肯定句改成否定句(共3页).doc

精选优质文档-倾情为你奉上把肯定句改成否定句把肯定句改成否定句分以下情况：1、 句中有be动词(am is are was were)的，在be动词后加not；(1) am- am not 缩写形式(2) is- is not (=isnt)(3) are- are not (=arent)(4) was- was not (=wasnt)(5) were- were not (=werent)2、 句中有情态动词（can, should, could）的，在情态动词后面加not； 缩写形式 (1)can- can not (cant) (2)should- should not (shouldnt) (3)could - could not (couldnt)3、 句中没有be动词和情态动词的，在动词前加dont或doesnt 或didnt（注意：dont或doesn