2. 表示“當(dāng)…時(shí)候”的 while, when, as 的用法區(qū)別是：while從句中的謂語(yǔ)動(dòng)詞必須是延續(xù)性動(dòng)詞；表示帶有規(guī)律性的“每當(dāng)”或當(dāng)主、從句謂語(yǔ)動(dòng)詞的動(dòng)作發(fā)生有先后時(shí)，只能用 when；當(dāng)表示“一邊…一邊…”或“隨著”時(shí)，只能用 as。另外，用于此義的 as 所引導(dǎo)的時(shí)間狀語(yǔ)從句謂語(yǔ)只能是動(dòng)作動(dòng)詞，不能是狀態(tài)動(dòng)詞。如下面一道高考題的答案是 B 而不能是A：
“I’m going to the post office.” “_____ you’re there, can you get me some stamps?”
A. As B. While C. Because D. If
3. until 在肯定句中通常只連用延續(xù)性動(dòng)詞，表示相應(yīng)動(dòng)作結(jié)束的時(shí)間；在否定句中通常連用非延續(xù)性動(dòng)詞，表示相應(yīng)動(dòng)作開(kāi)始的時(shí)間，意為“直到…才”。如：
He waited until she was about to leave. 他等著一直到她準(zhǔn)備離開(kāi)。
I did not begin to work till he had gone. 他走了后我才開(kāi)始工作。
4. 表示“一…就”除用 as soon as 外，還可用 the minute, the second, the instant, immediately, directly, instantly, no sooner…than, hardly…when 等。如：
I came immediately you called. 你一來(lái)電話(huà)我就來(lái)了。
Hardly had she arrived when it began to snow. 她剛到就下起雪來(lái)了。
The moment I have finished I'll give you a call. 我一干完就給你打電話(huà)。
5. every time, each time, (the) next time, (the) last time, by the time, the first time, any time 等以 time 結(jié)尾的詞語(yǔ)也可用作連詞，引導(dǎo)時(shí)間狀語(yǔ)從句。如：
Next time you come in, please close the door. 下次你進(jìn)來(lái)，請(qǐng)關(guān)門(mén)。
He didn’t tell me anything the last time I saw him. 上次我見(jiàn)到他時(shí)他什么也沒(méi)告訴我。
By the time I got home, she had already gone to bed. 我到家時(shí)她已睡覺(jué)了。
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