simple past &presant perfect ??????????

2006-12-16 2:26 am
simple past &presant perfect
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回答 (1)

2006-12-17 8:12 pm
✔ 最佳答案
simple past:
事件已過去,要明示發生時間
eg. I ate two apples YESTERDAY.
eg. She graduated LAST YEAR.

present perfect:
事件己過去(或者直到現在仍進行中),但沒有明示發生時間

eg. Mary has ALREADY finished her homework. 她已經完成功課,但沒有清楚交代甚麼時候完成

eg. Mary has not YET finished her homework. 她尚未完成功課,從「過去」到「現在」,她仍然在做功課。如果用 simple present or present continuous tense,就不能表達時間的轉變


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