第一類: 含有be的句子

is ,am 過(guò)去式was

are過(guò)去式were

在一般過(guò)去時(shí)態(tài)的任何句型中(肯定句，否定句，疑問(wèn)句)，be都變成過(guò)去式was或were

第二類: 實(shí)義動(dòng)詞做謂語(yǔ)的句子

肯定句:動(dòng)詞變過(guò)去式

例句:Last year,he worked in Shanghai.

否定句: didn't+動(dòng)詞原形

例句: He didn't finish his homework yesterday.

一般疑問(wèn)句: Did﹉+動(dòng)詞原形

例句: Did you see anything interesting in the museum?

特殊疑問(wèn)句:

特殊問(wèn)詞+一般疑問(wèn)句

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