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现在完成时(have/has + 过去分词)将过去与现在联系起来:未结束的时间段(this week)、生活经历,以及至今仍然重要的结果。
I have seen him last week.
I saw him last week. — 搭配"last week"这样已完结的时间状语时,用一般过去时,不用现在完成时。
I know her since five years.
I have known her for five years. — 搭配"for/since"使用现在完成时。
have lived
has never tried