一般过去时的否定是didn't do,现在完成时的否定是haven't done 或hasn't done 或hadn't done

英语否定句：
凡句中有动词be(am/is /are/was/were) ,情态动词(can/could/may/must/will/would/shall/should/...),助动词(have/has /had 完成时）的,变否定句时直接在这些词的后面加not,否则要加上相应的助动词don't / doesn't (一般般现在时第三人称单数用doesn't),didn't (一般过去时)
注：加了助动词之后原来的动词要用原形 .如：
1.He isn't a worker.(一般现在时）
2.He doesn't go to shcool on foot..(一般现在时）
3.He can't swim.(一般现在时）
4.They weren't at home yeste.（一般过去时）
5.He didn't go to school by bus yesterday..（一般过去时）
6.He won't go with you tomorrow.（一般将来时）
7.He hasn't finished his homework.（现在完成时）
8.He hadn't written to her when she rang him up.(过去完成时）
9.We aren't working now.（现在进行时）
10.They weren't having classes at this time yesterday.（过去进行时）
11.They wouldn't tell you about it.（过去将来时）
12.I shall not go with you.（一般将来时）
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