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1、肯定形式：主語(yǔ)+動(dòng)詞過(guò)去式+其他。

例句：She often came to help us in those days.

2、否定形式：

（1）was/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.

3、一般疑問(wèn)句：

（1）Did+主語(yǔ)+謂語(yǔ)動(dòng)詞原型+其他；例句：Did I do homework?

（2）Was/Were+主語(yǔ)+表語(yǔ)。