初中·課本中不會教你的 546　not...until/till和not...before

546　not...until/till和not...before

　not...until 是一種常用句型，意為“不到……不，只到……才……，之前……不……”。until前的句子用否定式，until后可跟從句，用肯定式，也可跟短語，作時間狀語。not...until 中的until表示“直到”，not...before 中的before表示“在……之前”，這兩個句型常可換用。

He won't leave until/before 10 o'clock. 他要到10點(diǎn)鐘才會離開。/他10點(diǎn)鐘之前不會離開。

I can not give the box to you until/before I see Mary. 見到瑪麗我才能把那只箱子給你。/見到瑪麗前我不能把那只箱子給你。

They didn't stop talking until the clock struck twelve. 直到鐘敲響12點(diǎn)他們才停止談話。

I didn't know the truth until then. 我直到那時才了解事實真相。

It is not until the bell rang that I realized that it was past midnight. 直到鈴響了我才意識到午夜已過。

Until you told me about it the day before yesterday, I had no idea of it. 直到你前天告訴我，我才知道。

提示

如果主句謂語動詞是延續(xù)性的，表示“直到……才”時，該動詞可用肯定式或否定式；如果主句謂語動詞是非延續(xù)性的（go, start, leave等），表示“直到……才”時，該動詞只能用否定式。

He won't stay here until she comes. 他在這里將不待到她來。

She won't live here until next month. 她在這里將不住到下個月。

I didn't wait until he returned. 我沒有等到他回來。

He won't go until six o'clock. （正）要到6點(diǎn)鐘他才去。

He will go until six o'clock. （誤）