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67.I didnt realize my mistake until I entered the office. 六级词汇讲解: not...until句型使用广泛，表示一直到。其中，not可以省略。如: Wait until tomorrow.等到明天。 英语六级考点归纳 与not...until句型类似的是till，二者用法的区别比较微妙，需要特别注意： 当主句是否定句时，意思是直到才，这时候常会使用not until的结构;如果将not until结构放在句首，那么主句要用倒装形式。如: I ) He didnt go to sleep until 12 last night. 他昨晚直到12点钟才睡觉。 2 ) Not until we pointed out their fault to them did they realize it. 直到我们指出他们的错误，他们才意识到。 当主句是肯定句时，意思是直到，这时候常会使用till。如: 1) The students made much noise till the teacher came into the classroom. 直到老师走进教室，学生们才停止了吵闹。 2 ) Dont open it till your birthday. 等到你生日那天再打开。 另外，until可以放在句首，而till则不行。如: 1)Until they used up ail their money, the young couple were very happy. 2)Till they used up all their money, the young couple were very happy. | 
