现在完成时和过去完成时的标志词是什么？ It is the first time... 是现在完成时...
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2\u3001\u8fc7\u53bb\u7684\u52a8\u4f5c\u6216\u72b6\u6001\u6301\u7eed\u5230\u73b0\u5728\u5e76\u4e14\u5df2\u7ecf\u5b8c\u6210\u6216\u53ef\u80fd\u6301\u7eed\u4e0b\u53bb\u3002
3\u3001\u73b0\u5728\u5b8c\u6210\u65f6\u8868\u793a\u5c06\u6765\u3002
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\u5c06\u6765\u65f6
现在完成时中 have/has+动词的过去分词 是核心。时间标志词是for sometime，ever，never，since，already，yet，before，twice，once，three times等。过去完成时中 had+动词的过去分词 是核心。此时态是发生在过去的过去，就是在过去之前发生的事，常用在从句里，而此时从句中一般有过去时。有时有标志词：by the year xxxx（2008、2007...）等
同学您好，如果问题已解决，记得右上角采纳哦~~~您的采纳是对我的肯定~谢谢哦
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