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It was not until she took off her dark glasses that I realized she was a film star. 中的 until 確實是引導時間狀語從句，因為很顯然 until 后面接的是一個有主謂結構的句子。　　

It was not until yesterday that I realized she was a film star. 中的 until 則是介詞，因為它后面接的是一個“詞”。　　

以下是 until 用作介詞的例子（until引導時間狀語短語）：　　

She stayed until noon. 她呆到中午才走。　　

It may last till Friday. 這可能要延續到星期五。　　

They held out until the last. 他們一直堅持到底。　　

I remain in London until May. 我在倫敦一直呆到五月。　　

I put off taking the test until next week. 我推遲到下周參加測試。　　

This rule is inoperative until further notice. 此規則何時生效待通知。　　

She stayed up reading until midnight. 她一直沒睡看書直到深夜。　　

How much time is there until lunch? 離吃午飯還有多長時間? 　　

We stayed up yarning until midnight. 我們山南海北一直講到深夜。　　

I’d like to stay here up until Christmas. 我想在這兒呆到圣誕節。　　

以下是 until 用作連詞的例子（until引導時間狀語從句）：　　

Stay here until I come back. 我回來之前你別走。　　

Cook the apple slowly until it is soft. 用文火把蘋果煮軟。　　

We polished the table until it shone. 我們把餐桌擦得锃亮。　　

Heat the milk until it is just lukewarm. 把奶熱一下, 溫溫就行。　　

I went to elementary school until I was 12. 我上小學上到12歲。 　　

He had polished the table-top until it gleamed. 他把桌面擦得很亮。　　

He waited until she was about to leave. 他等著一直到她準備離開。　　

Heat the butter until it browns. 把黃油加熱，直到變成褐色為止。　　

We’re waiting until the weather picks up a bit. 我們等到天氣好些再說。　　

We hung about until the shops were opened. 我們閑待著直到商店開門。　　

Smoking is forbidden until the plane is airborne. 飛機升空時禁止吸煙。　　

Keep straight on until you get to the church. 一直朝前走就走到教堂了。