英语四级考试必备语法知识点(4)

 　　在以as, than, when, if, unless等引导的从句中的省略: 在有些状语从句中,如果谓语包含有动词be,主语又和主句的主语一致a),或者主语是it b),就常常可以把从句中的主语和谓语的一部分(特别是动词be)省略掉.

　　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 acrobat¹ could ever perform those daring feats² 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) 引起的从句中,常会有一些成分省略.

　　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.

　　错误的省略

　　His life is as fully³ committed to books as anyone I know.

　　While standing⁴ there in her nightgown, two bullets struck the wall beside her.

　　一致

　　如果主语是单数,尽管后面跟有with, together with, as well as, as much as, no less than, more than等引导的短语,谓语动词仍旧用单数形式.

　　Terry, along with her friend, goes skating every Saturday.

　　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.

1 acrobat   

n.特技演员，杂技演员

参考例句：

• The acrobat balanced a long pole on his left shoulder.杂技演员让一根长杆在他的左肩上保持平衡。
• The acrobat could bend himself into a hoop.这个杂技演员可以把身体蜷曲成圆形。

2 feats   

功绩，伟业，技艺( feat的名词复数 )

参考例句：

• He used to astound his friends with feats of physical endurance. 过去，他表现出来的惊人耐力常让朋友们大吃一惊。
• His heroic feats made him a legend in his own time. 他的英雄业绩使他成了他那个时代的传奇人物。

3 fully   

adv.完全地，全部地，彻底地；充分地

参考例句：

• The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。
• They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。

4 standing   

n.持续，地位；adj.永久的，不动的，直立的，不流动的

参考例句：

• After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
• They're standing out against any change in the law.他们坚决反对对法律做任何修改。