結構形式：

　　肯定形式

　　主語+動詞過去式+其它

　　例句：She came to help us in those day．

　　否定形式

　　主語+didn't+謂語動詞原形+其它

　�、賥as/were+not；②在行為動詞前加didn't，同時還原行為動詞

　　例句：I didn't know you like coffee.

　　一般疑問句

　�、貲id+主語+謂語動詞原形+其它②Was/Were+主語+表語

　　例句：Did I do homework?

　　特殊疑問句

　　疑問詞+did+主語+動詞原形+其它

　　疑問詞+was/were+物主代詞/...'s+sth.