(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