初级英语语法重点、考点与难点(13)

2. a. Half of the buildings were destroyed in the fire. 有一半的楼房在大火中被毁。

b. Half of the building was destroyed in the fire. 这座大楼在大火中有一半被毁。

c. Half of the money was spent on food. 有一半 的钱用来买食物。

3. a. 30 percent of the workers here are women. 这 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. 墙 壁有30%已被刷漆。

10. means何时是单数何时是复数

All possible means ______ been tired.

Every possible means ______ been tired.

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

此题应选C。名词means(方法)的单复数同形, 用作主语时, 其谓语的单复数要视具体含义而定：

1. 如果means与all, such, these, those等词连用, 则其含义应该是复数：

These means are very good. 这些方法很好(www.hxen.net)。

Such means sound interesting, but in fact they’reimpossible. 那样的方法听起来有趣, 但实际上是不可能的。

2. 如果means与a, such a, this, that, every等词连用, 则其含义应该是单数：

Such a means is really unpleasant. 这样的方法确实是令人不愉快。

There is an effective means of doing it. 做此事有一种很有效的方法。

3. 有时从句意和上下文无法确定means 到底是单数还是复数, 则其谓语用单数或复数均可以：

做这事还有其它的什么办法吗?

正：Are there any other means of doing it?

正：Is there any other means of doing it?

没有好的方法。

正：There is no good means.

正：There are no good means.