爱华网While (I was) at college， I began to know him， a strange but able student. 我在上大学时就开始认识他， 一个奇怪但有能力的学生。
Don’t come in until (you are) asked to． 不叫你请你不要进来。
Whenever (it is) possible， you should come and help． 不管什么时候只要有可能你就该来帮忙。
You should let us know the result as soon as(it is) possible． 你应该尽快让我们知道结果。
二、条件状语从句中的省略
Send the goods now if (they are) ready． 货物如果准备好了， 现在就送过来。
If (it is) necessary， ring me at home． 如有必要， 给我家里打电话。
Come along with me if (it is) possible． 如果有可能和我一起去吧。
If (it is) true， this will cause us a lot of trouble． 如果是真的， 这会给我们带来很多麻烦。
There are few people nowadays， if (there are) any， who remember him．
即使有人， 现在能记起他的也是寥寥无几。
You should stay where you are， unless (you are) asked to leave． 你应该呆在你现在的地方不动， 除非叫你离开。
三、方式状语从句中的省略
as if / as though后加名词 /形容词 /副词 / 介词短语 / 现在分词 / 过去分词 / 不定式。
She talked to the stranger as if (she were) absent-minded． 她和陌生人谈话似乎心不在焉。
He opened the desk， as if (he was) in search of something important．
他打开抽屉仿佛要找什么重要的东西。
The boy is running impatiently here and there as if (he is) searching for something lost on the sports ground． 这男孩很不耐心地在操场上到处跑着似乎在找所丢失的东西。
The football player is rolling on the ground as if (he is) hurt badly in the leg． 足球运动员在操场上打着滚似乎他的腿伤得厉害。
He moved his lips as if(he wanted) to speak． 他的嘴动着仿佛要说什么。
四、地点状语从句中的省略
Lay these books where possible you can find them easily. 把这些书放在你容易找到的地方。
Put in articles wherever necessary in the following passages. 在下列文章中需要的地方填入冠词。
五、让步状语从句中的省略
He is a good man, though sometimes (he is) rather dull. 他是个好人， 尽管有时有点无聊。
Even if (I am) invited to, I won’t go to such a bad lecture. 即使请我去， 我都不想听如此糟糕的报告。
六、比较状语从句中的省略
She has finished the work earlier than (it has been) expected. 她比预料的提前完成这项工作。
She can play the piano just as wonderfully as you (do). 她钢琴弹得和你（弹的）一样好。
练习：
1. Generally speaking,_____according to directions, the drug has no side effect.
A. when taking B. when taken C. when to take D. when to be taken
2. Though________money, his parents managed to send him to university.
A. lacked B. lacking of C. lackingD. lacked in
3. When_____, the museum will be open to the public next year.
A. completedB. completing
C. being completed D. to be completed
4. The research is so designed that once________nothing can be done to change it.
A. begins B. having begunC. beginning D. begun
5. If_______the same treatment again, he’s sure to get well.
A. giving B. give C. givenD. being given
6. While building a tunnel through the mountain,________.
A. an underground lake was discovered
B. there was an underground lake discovered
C. a lake was discovered underground
D. the workers discovered an underground lake
7. -Will you go and attend her party?
-No,__________invited to.
A. if B. whenC. for not D. even if
8. The old tower must be saved,_______the cost.
A. however B. whicheverC. whatever D. wherever
9. You mustn’t touch it unless_______.
A. asking to doB. asked toC. asking toD. to be asked
10. If ______，the experiment will be successful.
A. do carefullyB. did carefully
C. carefully done D. doing carefully
参考答案：
1. B2. C3. A4. D5. C6. D7. D8. C9. B10. C
