I could have lent you the money. Why didn’t you ask me? 我本来可以借这笔钱给你的，你为什么不向我提出?
You needn’t have walked up; you could have taken the lift. 你没必要走着上去，你本来可以乘电梯的。
有时，也可根据语境译为“好在没有”，“差点”，尤其是当谈论的是不利情况时。如：
She felt miserable. She could have cried. 她感到很痛苦，她差点哭了。
That was a had place to go skiing—you could have broken your leg. 那不是一个滑雪的好地方，好在你没有把腿给摔断。
Why did you throw the bottle out of the window? Somebody could have been hurt. 你为什么把瓶子扔出窗外呢? 好在没有砸伤人。
could have done除了含有上述的意思外，还表示批评或责备
即表示过去本来有责任或义务应该做某事的，但实际上却没有做成，含有批评和责备的意味，通常译为“本来应该”，“本来可以”等，用法同上。例如：
You could have helped me—why did you just sit and watch? 你本来可以帮我一把嘛——为什么你只是坐在那儿观望呢?
I am disappointed that you didn’t tell me. You should have told me. 你没告诉我，我感到很失望，你本来应该告诉我的。

背单词的好方法
随时随地背单词
不知不觉背单词

Of the two possibilities, this is more likely than that. 两个可能性中，后者比前者更可能。
在比较级前用the表示程度(通常有表示原因、理由或条件的短语或从句)。如：
He’s had a holiday and looks the better for it. 他度假之后，气色好多了。
I love him all the more for his faults. 正因为他这些缺点，所以我越发爱他。
用于“the+比较级，the+比较级”，表示“越……越……”。如：
The younger you are, the easier it is to learn. 年纪越轻，学习越容易。
The better I know her, the more I admire her. 我对她越了解，我就越爱慕她。
The more money you make, the more you spend. 你挣的钱越多，花的钱也越多。
当by far用于修饰比较级且置于其前时，比较级前要用the。如：
He is by far the cleverer than her. 他比她聪明得多。

could have done 用于虚拟语气
在虚拟条件句中，当谈论过去的情况时，其句型通常是：主句用“could/would/might +have+过去分词”，if从句用过去完成时。例如：
You could have been killed if I hadn’t warned you. 我如不是警告了你，你就可能丧命了。
If he had known the facts, he could have told us what to do. 如果他了解事实，他是可能告诉我们怎样做的。
If you had come sooner, you could have helped us. 你如早来一点，就会帮上我们了。
I could have told them what happened if anybody had asked me. 如果有谁问过我，我可以告诉他们发生了什么情况。

It’s quicker by far to go by train. 坐火车去要快得多。
注：与比较级连用，通常要放在比较级之后，若放在比较级前，则比较级通常应带有冠词。如：
He is cleverer by far than her.
It’s by far the quicker to go by train.
最高级前冠词使用规律
在形容词最高级前通常用the。如：
He’s the best teacher even though he has the least experience. 他尽管经验最少，但教得最好。
当最高级形容词用作表语(尤其是用于which后)且不带比较范围时，the有时(尤其是非正式场合)可以省略。如：
This dictionary is (the) best. 这本词典最好。
Which of the boys is (the) strongest? 这些男孩子当中哪个力气最大？
但是，当处于表语位置的最高级带有比较范围或带有限定性修饰语时，其前的the通常不能省去。如：
This dictionary is the best I could find. 这是我能找到的最好的词典。
He was the strongest of all the students. 他是所有学生中最强壮的。

--You needn't take an umbrella. It isn't going to rain.
--Well, I don't know. It ________ do.
A. might
B. need
C. would
D. should
No one ________ be more generous; he has a heart of gold.
A. could
B. must
C. dare
D. need

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