一般过去时否定句有三种形式：
1、谓语动词是didn'；t + 动词原形。
举例，I didn'；t play just now.
2、谓语动词是情态动词的否定形式+动词原形。
举例，He couldn'；t speak English then.
3、谓语动词是be动词的否定形式。
举例，My mother wasn'；t at home yesrteday morning.
一般过去时否定句的三种结构
① be型：主语+was/were+not+其他。
I wasn'；t at home yesterday. 我昨天不在家。
②实义动词型：主语+didn'；t+实义动词原形+其他。
Tom didn'；t go hiking with his friends last weekend. 汤姆上周末没有跟他的朋友一起去远足。
③否定转移:
例如：I don”t think that he is a good boy. 我看他不是好孩子
I don”t believe that he can do the problem.我相信他不会做这道题
I imagine you are not interested in politics.我想你对政治不感兴趣
