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第一类: 含有be的句子

is ,am 过去式was

are过去式were

在一般过去时态的任何句型中(肯定句，否定句，疑问句)，be都变成过去式was或were

第二类: 实义动词做谓语的句子

肯定句:动词变过去式

例句:Last year,he worked in Shanghai.

否定句: didn't+动词原形

例句: He didn't finish his homework yesterday.

一般疑问句: Did﹉+动词原形

例句: Did you see anything interesting in the museum?

特殊疑问句:

特殊问词+一般疑问句