When ---當(dāng)……時候, 通常指某一特定的時間點，主句與從句的動作同時發(fā)生。
When I opened the window, I saw him come up.
When --- 正在……的時候，突然…。通常主句是進行時或 be about to 時，在翻譯的時候，when 可以譯成沒想到或突然。I was walking along the street , when I met him.
When 當(dāng)從句是進行時，主句是一般時，往往表示不滿。Someone knocked at the door when I was having breakfast.
When the children had gone to bed, she began to prepare her lessons.
While we were inAmerica, we saw him twice.
While ---表示一種不滿情緒，意思是這邊在干某種重要的事，而另一邊在享受等。We are cleaning the classroom while they are playing the football.
She was doing her homework as she was listening to the music.
As --- 當(dāng)……時，指一個動作緊接著一個動作發(fā)生，從句通常用進行時。As I was going out, it began to rain.
The moment --- 一……就…… =as soon as , immediately,---Did you remember to give Mary the money you owed her?---Yes, I gave her the moment I saw her.
He didn’t leave the office until he finished the work.
The passengers should arrive at the airport an hour before the flight departs.
The customer left the ticket counter after he had a quarrel with the ticket agent.
Since ---自從……, 通常主句用現(xiàn)在完成時I have never been there again since I graduated from the university.It is just a week since we arrived here. Jack went to school as soon as he got well.
No sooner than --- 一……就……no sooner… than… 用于句首要求倒裝No sooner had he arrived than he went away again.
Once you see him, you will never forget him.
Every time, each time 每次whenever 每當(dāng)Each time he came to town, he would visit our school.
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