簡單過去式發生在過去「歷史事件」 or 明確時間點"I went to New York two years ago."現在完成式(have/has + pp.)過去經驗、動作(1) 發生在過去,但我們沒有講什麼時候。"I've been to Taipei a couple of times."--Hosting provided by SoundOn
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