当你在谈论一段时间,它必须在某件事发生之前消失,可以实用 till 和 until;till 比 until 出现的早,被用了好几个世纪,它不是 until 的缩写;用作介词或连词,意为“直到……为止”,两者常可换用,有的人认为 until 比 till 稍正式,所以在正式文体中,一般用 until,而在口语或非正式文体中则两者都可用。一、till 和 until 用于肯定句中,表示动作一直持续到所说时间为止,主句谓语必须是持续性动词,例如:We waited until/till he came. Let's wait until the rain stops.He put his retirement on hold until he had found a solution. I'm just killing time until I can talk to the other witnesses. Until now I have always lived alone. He continued working up until/till his death. The street is full of traffic from morning until/till night.Until 1982 he was senior lecturer in botany at Durham University.1982年以前他一直是达勒姆大学生物系的高级讲师。二、若主句用终止性动词,则应为否定式 not ... until ... (因为终止性动词一旦被否定就成为状态,便可持续),意为“直到......才,在......以前不”,例如:I didn't go to bed until/till tomorrow.We did not get off the bus until/till it stopped.The traffic laws don't take effect until the end of the year.We didn’t leave until/till he came. You're not going out until/till you've finished this.
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