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考点3、集合名词的数
一般地说，集合名词只以单数形式出现。常见的有：family，police，cattle，team，people，government，class，group，audience（观众），public（公众），crew（全体船员）等。当这些名词作主语时，若表示一个整体时，谓语动词用单数形式；若表示集体的每一个成员时，谓语动词用复数形式。
His family is a big family./ The whole family are watching TV now.
The government welcomes the proposal.（政府欢迎该建议。）
The government are discussing the proposal.（政府官员正在讨论该建议。）
注意：
police和cattle后面的谓语动词总是用复数形式
Many cattle are kept on the farm.
Several hundred police are on duty.
考点4、of+抽象数=相应的形容词
of+geat+抽象名词=very+相应的形容词
of+no+抽象名词=not+相应的形容词（or -less，un-）
这样的抽象名词主要有：importance，value，use，help
The dictionary is of great use/help.=The dictionary is very useful/helpful.
The meeting is of great importance.=The meeting is very important.
Ginseng is of great medicine value. （西洋参具有很高的药用价值。）
Your advice is of great value to us=Your advice is very valuable to us.
His suggestion is of no use=His suggestion is not useful.
That program is of great interest to the children.
=That program is very interesting to the children.
但是，of+color/age/height/width常用来表示具有同样的颜色、年龄、高度、宽度等等。
These two jackets are of the same color.（这两件夹克衫颜色一样。）
We‘re of the same age.（我们年龄一样大。）
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