1、相关主句谓语必须是持续性动词,若是终止性动词,则应为否定式(因为终止性动词一旦被否定就成为状态,便可持续)。如:
We waited until [till] he came. 我们一直等到他来。
We didn’t leave until [till] he came. 直到他来我们才走。
2、引导时间状语从句时,其谓语要用现在时表示将来意义。如:
I won’t leave until he comes back tomorrow. 我要等他明天回来再走。
3、有时其后可跟副词、介词短语或从句等。如:
He has been ill until recently. 他最近一直生病。
until:
1、There will be a wonderful match tonight. I will watch it until it finishes.
今晚有一场精彩的比赛。我要看完它。
2、Continue in this direction until you see a sign.
一直沿着这个方向走,直到你看见一个指示牌为止。
3、he refused to comment until after the trial.
在审判结果出来之前他拒绝给予任何评论。
till:
1、Generally, the morning seems to have no end, for Mr. Candidate comes at ten and stays till two.
一般来说,早晨似乎没有尽头,因为凯迪达特先生十点来,会一直待到两点。
2、Once he started a job, he saw it through till it was finished.
只要他着手做一件事, 就非做完不可。