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2. a. Half of the buildings were destroyed in the fire. 有一半的樓房在大火中被毀。

b. Half of the building was destroyed in the fire. 這座大樓在大火中有一半被毀。

c. Half of the money was spent on food. 有一半 的錢用來買食物。

3. a. 30 percent of the workers here are women. 這 里的工人有30%是女性。

b. 30 percent of the work has been done. 有 30% 的工作已完成。

c. 30 percent of the wall has been painted. 墻 壁有30%已被刷漆。

10. means何時(shí)是單數(shù)何時(shí)是復(fù)數(shù)

All possible means ______ been tired.

Every possible means ______ been tired.

A. have, have            B. has, has                C. have, has              D. has, have

此題應(yīng)選C。名詞means(方法)的單復(fù)數(shù)同形, 用作主語(yǔ)時(shí), 其謂語(yǔ)的單復(fù)數(shù)要視具體含義而定：

1. 如果means與all, such, these, those等詞連用, 則其含義應(yīng)該是復(fù)數(shù)：

These means are very good. 這些方法很好(www.hz123456.com)。

Such means sound interesting, but in fact they’reimpossible. 那樣的方法聽起來有趣, 但實(shí)際上是不可能的。

2. 如果means與a, such a, this, that, every等詞連用, 則其含義應(yīng)該是單數(shù)：

Such a means is really unpleasant. 這樣的方法確實(shí)是令人不愉快。

There is an effective means of doing it. 做此事有一種很有效的方法。

3. 有時(shí)從句意和上下文無(wú)法確定means 到底是單數(shù)還是復(fù)數(shù), 則其謂語(yǔ)用單數(shù)或復(fù)數(shù)均可以：

做這事還有其它的什么辦法嗎?

正：Are there any other means of doing it?

正：Is there any other means of doing it?

沒有好的方法。

正：There is no good means.

正：There are no good means.

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