一般过去时的句法结构:
1、肯定形式
主语+动词过去式+其它
例句:She came to help us in those days.
2、否定形态
主语+didn't +谓语动词原形+其它
1.在行为动词前加didn't,同时还原行为动词
例句:I didn't know you like coffee.
3、一般疑问句
①Did+主语+谓语动词原形+其它
②Was/Were+主语+表语
例句:Did you do homework?
4、特殊疑问句
特殊疑问词+ did+主语+动词原形+其它?
特殊疑问词+was/were+物主代词/...'s+sth.?
5、被动语态
主语 + was / were + 动词的过去分词