✔ 最佳答案
我們為已經發生了的行動使用现在完成时時態,但是 沒有测量行動的確切的时期。
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我們為以前發生和繼續入禮物的行動使用现在完成时時態
2010-01-17 23:03:54 補充:
for example
I had finished my homework.<-----------an action had past(同過去係完全無關係)
I have waited him since 2:00p.m.<----------(一個動作從之前到e家,係同將來仲有關連,你e家都仲未見到佢個人影)
所以千其吾好撈亂present perfect & past perfect
2010-01-17 23:08:36 補充:
吾好意思 第二個example 係 I have waited him since 2:00pm but he does not yet appear till now!