① He has worked there since1989.
② She has lived here since she moved here.
Ⅱ. from 自从 只用作介词,表一个事情的开始点,可用于过去、现在或将来的时态。如:
① They worked from 7:00 to 12:00 this morning.
② We have been good friends from childhood.
Ⅲ. for 作为介词,后面接段时间,用于完成时、现在时、过去时和将来时,句中要用延续性动词。如:
① Well stay here for ten minutes.我们将在这儿呆10分钟。
They have studied English for three yeas.
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