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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 (责任编辑：admin) |