英语新概念2,第一篇课文里有一句 why did the writer complain to the people b

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/16 00:01:51

英语新概念2,第一篇课文里有一句 why did the writer complain to the people behind him?
这里为什么要加个did?去掉不影响翻译啊!难道疑问句需要加did?

陈述句变特殊疑问句,有be动词的把be 动词提前,没有be动词的要加助动词 do/ did/ has/ had 的.
再问： has/ had 也是助动词啊？
再答：当它们用在现在完成时和过去完成时中的时候是助动词。 have done sth 例如： How many times have you been to America? has done sth 例如： How many times has she been to America? had done sth 例如： How many times had she been to America before she moved to America?

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