练习册

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    区别:现在完成时侧重于动作的结速或完成,而现在完成进行时侧重于动作的未结束和继续进行. 例:1)I have opened the can. 2) I have been writing the letter since then.1.现在完成进行时的形式: 1)主动语态:主语+have/has+现在分词 2)被动语态:主语+have/has been+过去分词 例:Have you been waiting for him all the day? 【查看更多】

     

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