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在表示成功地完成某一具体动作时，通常不用could，而用beable to;如果表示某一动作没有取得成功，则可用couldn't：

It's a pity he couldn't visit Mary.

很遗憾他没能去看望玛丽。

Oh, didn't you know? He was able to visit her afterall.

噢，你不知道吗?他最终还是能去看她了。

在问及过去某一具体活动时可用 could，但回答是肯定的时候则不能：

Could he borrow a car?

他能借到车了吗?

Yes, he was able to borrow a car after all.

是的，他最终还是能借到车了。

No, he couldn't.

不，他没能借到。

词汇学习 Word study

1.lie vi.

(1)躺，(平)卧：

While I sat by the fire, my dog lay beside me.

当我坐在火炉旁时，我的狗躺在我旁边。

Don't lie on the floor! It's too cold.

别躺在地板上!太冷了。

(2)位于：

The mountains lie below us now.

现在群山在我们的下方。

Our village lies between a river and a road.

我们的村子位于一条河流和一条公路之间。

The town lies to the east of London.

这镇子位于伦敦东面。

2.含有介词at的词组

at与许多词可以构成固定词组，其中表示时间的有：at first(开始时，最初)，at once(马上，立刻)，atpresent(目前，现在)，at last(最后，终于)， at times(有时);表示地点的有：at home(在家)，at school(在学校);表示程度的有： at least(至少)， at any rate(不管怎样)。其他词组有at heart(内心里，实际上)，at a loss(困惑不解，不知怎么办)等。

At first they were able to take photographs.

开始时他们还能照相。

Byrd at once ordered his men to throw out food sacks.

伯德马上命令他的助手们把食物袋扔掉。

At last the plane was able to rise.

最后飞机终于可以上升了。

At times I think this house will be knocked down by a passing plane.

有时我觉得这房子将会被一架飞过的飞机撞倒。

At any rate, I'm determined to stay here at present.

不管怎样，目前我决定留在这儿。

At least, I'm not mad yet.

至少我还没疯。

If Billy isn't at school, he must be at home.

如果比利不在学校，他肯定在家。

People have more money now, yet the temptation to steal is greater than ever before Why?I'm at a loss.

人们现在比以前有钱，但偷窃的诱惑力却比以往任何时候都更大。为什么呢?我感到很困惑。

Though he tried to make conversation with the lady, he wasn't interested in her at heart.

虽然他试图与那位妇女聊天，他实际上对她并不感兴趣。

练习答案 Key to written exercises

1.关键句型练习答案

A were able to take(1.3); could…get over(1.6); was then able to rise(1.8); would be able toreach(1.9); was able to fly (1.10)

2.难点练习答案

1 at last 2 at home 3 at once 4 at the moment 5 at times6 was at a loss 7 At first

3.多项选择题答案

1 b 2b 3 a 4 a 5 d 6 d

7 a 8 c 9 c 10 d 11 a 12 c

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