现在完成时的结构
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现在完成时的结构
现在完成时的结构
现在完成时的结构
肯定句:have/has +v.(过去分词)
eg.I have already finished my homework .
否定句:have/has +not +v.(过去分词)
eg.I haven't heard from him yet.
一般疑问句:Have/Has+主语+v.(过去分词)
eg.Have you ever been to Beijing?