一般过去时句法结构
肯定形式
主语+动词过去式+其它
例句:She came to help us in those days.
否定形式
主语+didn't+谓语动词原形+其它
①was/were+not;②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.
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 I do homework?
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.?
被动语态
主语+was/were+动词的过去分词