結(jié)構(gòu)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.