1 .许多状语从句可以有词省略，特别是在when , while , though , if , as if ( though ) ，等后面，省略的词多为它的主语和动词be :
Look out for cars when crossing the street .
She talked while preparing their supper .
Though not large , the room was light and airy .
If necessary , I'll have the letter duplicated .
She hurriedly left the room as if ( though ) angry ?
This viewpoint , however understandable , is wrong .
Whenever known , such facts should be reported .
Fill in the blanks with articles where ( ever ) necessary .
Many Others are doing better than we are .
They were heavier than he had expected ，
Water was important to us as oxygen .
Working hard as usual , I expect .
Anything you want to take with you ?
Sorry , the line is busy .
Hope you'll like it .
We'll certainly help you if we can .
I won't disturb you again unless I have to .
The sooner , the better .
1 . When taken according to the directions , the drug has no side effects .
2 . Though reduced in numbers, they gained infighting capacity.
3 . Often she would weep when alone .
4 . While in London Lenin studied the English labour movement .
5 . He would never do this unless compelled.
6 . I will return them as soon as possible .
8 . He glanced about as if in search of something .
9 . lf possible , I should like to have two copies of it .
1 . Nothing more you want to say ?
1 . 没有什么别的话要说了?
2 . Too bad you can't join us in the celebration .
2 . 很遗憾你不能来参加我们的庆祝。
3 . Don't know what they'll do next .
4 . If he doesn't want to stay in bed, we'd better not force him to.
5 . Her opinion, whether right or wrong, should be considered.
6 . We'll get everything ready tomorrow if not earlier.
7 . I'll do all I can to help them .