67.I didnt realize my mistake until I entered the office.
六級詞彙講解:
not...until句型使用廣泛，表示一直到。其中，not可以省略。如:
Wait until tomorrow.等到明天。
英語六級考點歸納
與not...until句型類似的是till，二者用法的區別比較微妙，需要特別注意：
當主句是否定句時，意思是直到才，這時候常會使用not until的結構;如果將not until結構放在句首，那麼主句要用倒裝形式。如:
I ) He didnt go to sleep until 12 last night.
他昨晚直到12點鐘才睡覺。
2 ) Not until we pointed out their fault to them did they realize it.
直到我們指出他們的錯誤，他們才意識到。
當主句是肯定句時，意思是直到，這時候常會使用till。如:
1) The students made much noise till the teacher came into the classroom.
直到老師走進教室，學生們才停止了吵鬧。
2 ) Dont open it till your birthday.
等到你生日那天再打開。
另外，until可以放在句首，而till則不行。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.
六級詞彙講解:
not...until句型使用廣泛，表示一直到。其中，not可以省略。如:
Wait until tomorrow.等到明天。
英語六級考點歸納
與not...until句型類似的是till，二者用法的區別比較微妙，需要特別注意：
當主句是否定句時，意思是直到才，這時候常會使用not until的結構;如果將not until結構放在句首，那麼主句要用倒裝形式。如:
I ) He didnt go to sleep until 12 last night.
他昨晚直到12點鐘才睡覺。
2 ) Not until we pointed out their fault to them did they realize it.
直到我們指出他們的錯誤，他們才意識到。
當主句是肯定句時，意思是直到，這時候常會使用till。如:
1) The students made much noise till the teacher came into the classroom.
直到老師走進教室，學生們才停止了吵鬧。
2 ) Dont open it till your birthday.
等到你生日那天再打開。
另外，until可以放在句首，而till則不行。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.
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