(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.