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1.prep用于肯定句，与延续性动词相连（直到…为止
I have been theretill last week
我在那儿一直呆到上个星期用于否定句，与短暂性动词相连（在…之前，直到…才）
Don·t call me till eight o’clock在八点之前给我打电话
3.conj主句为肯定句，谓语为延续性动词（直到…为止）I lived in the country till I was fifteen
我在乡下一直住到十五岁
主句为否定句，谓语为短暂性动词（在…之前，直到…才）He didn`t come back till he finished his homework直到完成作业他才回来
Not --- until 句型
(1) 陈述句 not --- until --- 直到……才
例：Last night I didn't go to bed until 11 o'clock. 昨晚我11点钟才睡觉。
(2) 强调句 It wasn't until…that... 直到……才…….
例：It wasn't until yesterday that I got your letter.
我直到昨天才收到你的来信.
(3) 倒装句 Not until...did... 直到……才…….
例：Not until I began to work did I realize how much time I had wasted.
直到我开始工作,我才意识到我已蹉跎了很多岁月.
