結構形式：

　　肯定形式

　　主語(yǔ)+動(dòng)詞過(guò)去式+其它

　　例句：She came to help us in those day．

　　否定形式

　　主語(yǔ)+didn't+謂語(yǔ)動(dòng)詞原形+其它

　　①was/were+not；②在行為動(dòng)詞前加didn't，同時(shí)還原行為動(dòng)詞

　　例句：I didn't know you like coffee.

　　一般疑問(wèn)句

　　①Did+主語(yǔ)+謂語(yǔ)動(dòng)詞原形+其它②Was/Were+主語(yǔ)+表語(yǔ)

　　例句：Did I do homework?

　　特殊疑問(wèn)句

　　疑問(wèn)詞+did+主語(yǔ)+動(dòng)詞原形+其它

　　疑問(wèn)詞+was/were+物主代詞/...'s+sth.