When ---當……時(shí)候, 通常指某一特定的時(shí)間點(diǎn)，主句與從句的動(dòng)作同時(shí)發(fā)生。
When I opened the window, I saw him come up.
When --- 正在……的時(shí)候，突然…。通常主句是進(jìn)行時(shí)或 be about to 時(shí)，在翻譯的時(shí)候，when 可以譯成沒(méi)想到或突然。I was walking along the street , when I met him.
When 當從句是進(jìn)行時(shí)，主句是一般時(shí)，往往表示不滿(mǎn)。Someone knocked at the door when I was having breakfast.
When the children had gone to bed, she began to prepare her lessons.
While ---在……期間，往往指一段時(shí)間。While we were inAmerica, we saw him twice.
While ---表示一種不滿(mǎn)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……時(shí)，指一個(gè)動(dòng)作緊接著(zhù)一個(gè)動(dòng)作發(fā)生，從句通常用進(jìn)行時(shí)。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……, 通常主句用現在完成時(shí)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Each time he came to town, he would visit our school.
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