现在完成式:以说话时刻作为参照点,之前发生的事在“现在”之前已完成(completed by the present):
Past Present
——————|——————|——————|————→
homework dinner Reference
I have done my homework (by now).
I have eaten dinner (by now).
——劉美君. (2012). 英文文法有道理! 重新認識英文文法觀念. 聯經.
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