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延续性动词和非延续性的怎么区分好

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延续性动词和非延续性的怎么区分好
别复制来的,我希望能弄懂
非常简单.
1 延续性动词.比如说:
for + 时间段------ for five years
since+时间点------ since Sunday
till +时间点 ------- till next week / till last week
2 非延续性/ 瞬间动词,比如说:
not -- - - until- - - - ---------not stop until she arrives
时间段+ago --------- The dog died two days ago
特指的过去时间--------He came last week
when + 瞬间动词,延续性动词----- when she came,i was waiting.
while +延续性动词,瞬间动词------While i was waiting,she came.