2.集体名词如: family, class, army, enemy, government, group, team等作主语时, 如果将其看作一个整体, 则谓语动词用单数, 若看成其中的成员(个体), 则谓语动词用复数

a. My family ______(be) a happy one.

　All my family _____(be) music lovers.

b. Our class ______(be) the best in our school.

　The whole class _____(be) having a discussion about the problem.

3.表示时间, 长度, 距离, 金额, 价值, 重量, 容量等的复数名词作主语时, 通常作整体看待, 即表示总量或总和, 谓语动词用单数. 若把它们看作一个个的个体, 即强调其具体数量时, 谓语动词用复数形式

a. Twenty years _____(be) a long time to us.

b. Two hundred miles ______(be) not a long distance.

c. Ten thousand US dollars ______(be) a lot of money.

d. There ______(be) ten minutes left.

4.主语从句作主语时, 谓语动词通常用单数. 但若主语从句所指的具体内容为复数意义时, 谓语动词用复数

a. What we need ______(be) more time.

b. What we need _______(be) more doctors.

5.代词none和neither作主语时, 谓语动词可单数可复数

a. None of them ___ (have)a car. ( 他们没有一个人有汽车 )

b. None of them _______(have) a car. ( 他们都没有汽车 )

c. Neither of them _______(know) the answer. ( 他们两个谁也不知道答案 )

d. Neither of them _______(know) the answer. ( 他们两个都不知道答案 )

6. 分数或百分数 + of + 名词 作主语时, 谓语动词视名词的数采用单数或复数.

a. Over three quarters of the city_____(be) destroyed in the war.

b. 35 percent of the doctors ______(be) women.

c. Thirty percent of the workers _____(be) out of work now.

d. One third of the water ______(have) been wasted.