when
副词 adv.
1.什么时候
2.（用于时间的表达方式之后）在那时,其时
3.其时；当时；当场
连接词 conj.
1.在…时,当时
2.如果,要是
When the weather is good,I usually go to the country.
若是天气好的话,我总是到乡下去.
3.既然,考虑到
4.在…之后
5.在任何…时候
6.一…就；刚…就
7.虽然；然而；可是
代词 pron.
1.什么时候
2.那时
while
连接词 conj.
1.在…期间,当…的时候; 与…同时
While in prison,he wrote his first novel.
他在狱中写出了第一部小说.
2.虽然,尽管
3.而,然而
名词 n.
1.(一段)时间
及物动词 vt.
1.消磨,打发(时间)
2.(愉快而懒散地)度过(时间)(常与 away 连用)
as
副词 adv.
1.同样地,一样地
She is as tall as her mother.
她和她母亲一样高.
The dining room was twice as big as the Tom's.
这个餐厅比汤姆的餐厅大一倍.
This is as difficult a problem as you are likely to meet.
像这样的难题,你可能会碰到.
介词 prep.
1.(表示时间)当还是…的时候
As a schoolboy,he showed every sign of genius.
当他还是个小学生的时候,就显示出了天资聪慧.
2.(表示方式)以…的身份,以…资格,作为; 以…形式,以作为; 以…角色,扮演…角色; 如同,像
3.(表示结果)成为,看作,看成
We had better treat it as a joke.
我们最好把它当作玩笑.
4.(表示目的)为了,以…为目的
The dykes were built as a protection against the sea.
建筑堤坝是为了防止海水泛滥.
5.(表示举例)例如,诸如…之类的
We talked about such subjects as the weather.
我们谈论了诸如天气之类的话题.
连接词 conj.
1.在…期间,当…时候
I was coming in as he was going out.
我进来的时候,他正出去.
2.尽管,即使,虽然
Intelligent as you are,I suspect you will fail.
尽管你聪明,我猜想你会失败.
3.像…一样
4.由于,因为
As you weren't there I left a message.
因为你不在那里,我留了个信儿.
5.照…方式
6.正如；如同
as soon as
1.一经...;立即...;一...就...
Come here as soon as you finish the work.
工作一结束你就到这里来.