Look out for cars when crossing the street.
When taken according to the directions, the drug has no side effects.
While there he joined in voluntary labour on a project.
Although not yet six months old, she was able to walk without support.
If not well managed, irrigation can be harmful.
Though reduced in numbers, they gained in fighting capacity.
This viewpoint, however understandable, is wrong.
Enemies, once discovered, were tightly encircled and completely wiped out.
She hurriedly left the room as though/if angry.
She worked extremely hard though still rather poor in health.
Fill in the application as instructed.
Whenever known, such facts should be reported.
The documents will be returned as soon as signed.
He said that no acrobat could ever perform those daring feats unless trained very young.
Once having made a promise, you should keep it.
If necessary I’ll have the letter duplicated.
Fill in the blanks with articles where(ver) necessary.
If possible, I should like to have two copies of it.
As scheduled, they met on January 20 at the Chinese Embassy.
在以than a) 或 as b) 引起的從句中,常會有一些成分省略.
He told me not to use more material than (it is) necessary.
We should think more of the collective than of ourselves.
They worked with as much enthusiasm as young people (did).
He is now a vice-manager, but still often works in the kitchen as before.
Their training is free, as is all education.
We will, as always, stand on your side.
錯誤的省略
His life is as fully committed to books as anyone I know.
While standing there in her nightgown, two bullets struck the wall beside her.
一致
如果主語是單數(shù),盡管后面跟有with, together with, as well as, as much as, no less than, more than等引導的短語,謂語動詞仍舊用單數(shù)形式.
Terry, along with her friend, goes skating every Saturday.
代詞作主語時的一致
each, either, neither和由some, any, no, every構(gòu)成的復合代詞,都作單數(shù)看待.
Each of us has something to say.
Is everybody ready?
Somebody is using the phone.
Neither of us has gone through regular training.
Has either of them told you?
some, few, both, many 等作復數(shù)
some 可后接復數(shù),也可接單數(shù),表示某一.
none作復數(shù)看待時較多,但也有時作單數(shù)看待,主要看說話人腦中聯(lián)系想到的是復數(shù)還是單數(shù)概念, 但none 在代表不可數(shù)的東西時總是看作單數(shù):
None of the books are easy enough for us
None of us seem to have thought of it.
None (= not a single one) of us has got a camera.
None (= nobody) has felt it more keenly than she did.
None of this worries me.
all 和most 可后接復數(shù),也可接不可數(shù)名詞 (all of the…, most of the …), 動詞用單數(shù).
由and 或 both… and 連接名詞詞組時, 后用復數(shù); 由not only…but (also), either…or, neither…nor或 or 連接的并列主語, 謂語通常和最鄰近的主語一致
Not only the switches but also the old writing has been changed.
My sister or my brother is likely to be at home.
Either you or Mr Yang is to do the work.
Neither my wife nor I myself am able to persuade my daughter to change her mind.
如果一個句子是由there 或here引導, 而主語又不止一個, 謂語通常也和最鄰近的那個主語一致。
There was carved in the board a dragon and a phoenix.
Here is a pen, a few envelopes and some paper for you.
people, police, cattle, poultry (家禽), militia (民兵) 等通常都用作復數(shù).
Cattle are grazing on the pasture.
The police are looking for him.
有些集體名詞有時作單數(shù)看待, 有時作復數(shù)看待, 主要根據(jù)意思來決定.
His family isn’t very large.
His family are all music lovers.
The committee meets twice a month.
The committee are divided in opinion.
The audience was enormous.
The audience were greatly moved at the words.
有些名詞單復數(shù)同形, 可根據(jù)意思決定謂語動詞的數(shù):
This new series is beginning next month.
These new series are beginning next month.
This species is now extinct.
These species are now extinct.
表示時間, 重量, 長度, 價值等的名詞, 盡管仍是復數(shù)形式, 如果作整體看待, 動詞也可用單數(shù)形式 (當然用復數(shù)動詞也是可以的):
Three weeks was allowed for making the necessary preparations.
One hundred li was covered in a single night.
書名, 國家名用單數(shù):
Tales from Shakespeare is a book by Charles Lamb.
學科名, 如mathematics, economics用單數(shù).
many a 或more than one 所修飾的詞作主語時, 謂語動詞多用單數(shù)形式:
Many a person has had that kind of experience.
More than one person has involved in the case.
a number of 后接復數(shù), the number of后接單數(shù):
A number of books have been published on the subject.
The number of books published on the subject is simply amazing.
one of those 后用單數(shù). 在“one of + 復數(shù)名詞 +關(guān)系分句”結(jié)構(gòu)中，關(guān)系分句中謂語動詞的單復數(shù)形式在一般情況下有兩形式，一是根據(jù)先行詞采用復數(shù)形式：
Joan is one of those people who go out of their way to be helpful.
當one 之前友the only 等限定詞和修飾語時，關(guān)系分句謂語動詞根據(jù)one 而定，即采用單數(shù)形式：
He is the only one of those boys who is willing to take on another assignment.
Joan is one of those people who go out of their way to be helpful.
當one 之前友the only 等限定詞和修飾語時，關(guān)系分句謂語動詞根據(jù)one 而定，即采用單數(shù)形式：
He is the only one of those boys who is willing to take on another assignment.
An expert, together with some assistants, was sent to help in this work.
The captain, as well as the coaches, was disappointed in the team.
