数词做主语的情况：
1.“分数+of+不可数名词”看成单数;“分数+of+可数名词复数”看成复数。
Nearly three-fourths of the surface of the earth is covered by water. 地球表面的近四分之三被水覆盖。
Two-thirds of the students in this college are girls. 这所学院的学生三分之二是女生。
2.在谈到一些数学问题时，把数字看成单数。
One and two is three.
动名词和不定式做主语，谓语动词用单数形式。例如：
Talking to people from other parts of the world is a good way to learn geography. 和世界其他地方的人交谈是学习地理的好方法。
To see is to believe. 百闻不如一见。
主语从句一律看成单数，例如：
When he will go to visit Beijing has not been decided. 他什么时候去参观北京还没有决定。
Whether he will go there with us is not important. 他是否和我们一起去那不重要。
其它需要注意的：
“the+形容词”表示一类人或者事物，看成复数。
The rich don’t always feel happier than the poor. 有钱人不是总比穷人感觉更快乐。
“the +姓氏的复数形式” 表示“姓….的一家人”，看成复数。
The Chens are very friendly to me.
名词所有格(或者名词性物主代词)单独使用，表示复数意义看成复数，表示单数意义看成单数。
His father is a teacher, but Tom’s is not.
My trousers are black, while Tom’s are blue.
练习：
用所给动词的适当形式填空：
1. An elephant _______ (be) much heavier than a horse. is
2. Money ________ (not mean) everything. doesn’t mean
3. Light ______ (go) faster than sound. goes
4. Class 3 ______ (have) an English class now. are having
5. Maths _______ (be) my favourite subject. What about you? is
6. This kind of bike _______ (be) made in Shanghai. is
7. Water and oil ______ (be) liquid. are
8. Nearly all of the students ______ (go) to play games on the playground. go
9. Neither they nor Tom _______ (come) from America. comes
10. There _____ (be ) some boys playing football on the playground. are
11. There ______ (be) some good news for you. is
12. The great politician and militarist (军事家)_____ (be) warmly welcome by the people in his hometown. was
13. What I know about him _______ (be) that he is from Jiangxi. is
14. Having enough sleep ______ (be) is very important for us. is
15. How much _______ (be) one and three? is
16. Twenty minutes _______ (be) not enough for me to do so much work. is
17. My telephone number ______ (be) 3366222. is
18. None of the answers _______ (be) right. is/are
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