英语各种问句.一般：He speaks Chinese.Does he speak Chinese?过去：She went to school yesterday.Did she go to school yesterday?现在完成：He has lived here since 1949.Has he lived here since 1949?为什么一般、过去的疑问句中
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英语各种问句.一般：He speaks Chinese.Does he speak Chinese?过去：She went to school yesterday.Did she go to school yesterday?现在完成：He has lived here since 1949.Has he lived here since 1949?为什么一般、过去的疑问句中
英语各种问句.
一般：He speaks Chinese.Does he speak Chinese?
过去：She went to school yesterday.Did she go to school yesterday?
现在完成：He has lived here since 1949.Has he lived here since 1949?
为什么一般、过去的疑问句中动词都改原型,而现在完成时的疑问句中动词不改?
英语各种问句.一般：He speaks Chinese.Does he speak Chinese?过去：She went to school yesterday.Did she go to school yesterday?现在完成：He has lived here since 1949.Has he lived here since 1949?为什么一般、过去的疑问句中
这是规定,记住了,就可以了
现在完成时要求：助动词 have/has + 现在分词。 lived 在句子中是现在分词，（完成时的）疑问句把助动词 has 提前，形成倒装，而现在分词没有变化。明白了吗？
亲，还需要解答么？
英语中疑问句中就是把助动词提前，前两句的助动词是do,而根据具体语法来讲，一般现在时第三人称单数助动词用does，后面动词用原形。一般过去时的第三人称单数助动词用did，动词也是要用原形。
而完成时的助动词就是has或者have了，具体看单复数了。完成时的形式就是要have/has+过去分词，所以完成时的疑问句里动词还是要用过去分词。
谢谢~...
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亲，还需要解答么？
英语中疑问句中就是把助动词提前，前两句的助动词是do,而根据具体语法来讲，一般现在时第三人称单数助动词用does，后面动词用原形。一般过去时的第三人称单数助动词用did，动词也是要用原形。
而完成时的助动词就是has或者have了，具体看单复数了。完成时的形式就是要have/has+过去分词，所以完成时的疑问句里动词还是要用过去分词。
谢谢~
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