3．用在目的状语从句中，构成谓语。
He wants
to take a taxi so that he may get there in time.
他想坐出租车，这样他就能及时到达那里。
I
arrived at the airport earlier in order that I might meet him.
我早早地就到了机场为了能接到他。
4．有时可以用于祈使句表示祝愿。
May you
succeed.
祝你成功
May you
be happy.
祝你快乐。
May that
day come soon.
希望这一天早日到来。
B. can和could
1．表示能力，可译为“能，会”。
I can
swim.我会游泳。
Emily
can dance well and her mother could dance well when she was young.
艾米丽舞跳得很好，她妈妈年轻时舞跳得也很好。
The
cinema can seat 1,000 people.
这电影院能容纳1，000人。
I could
not read such an easy book when I was 7 years old.
我七岁时连如此简单的书我也看不懂。
2．表示允许、许可，常用在口语中。could比can语气上要客气。
---
Could I use your dictionary
我可以用一下你的字典吗？
---Yes,
go ahead.
可以，用吧。（或Yes,
you can.但不能说Yes, you could.）
Could
Can you tell me how to get to the zoo
劳驾，你能告诉我怎么去动物园吗？
He asked
me whether he could take the book out of the reading room.
他问我可不可以把书带出阅览室。
3．表示推测，可用于肯定句（can罕见）、否定句和疑问句，但更常见于疑问句或否定句。在此种用法中can和could没有时态的区别，只是表示可能性的大小，can表示推测的可能性比could大。
Can he
be ill at home
他会是生病在家吗？
Can the
story be true
这个故事会是真的吗？
He
cannot be at home.
他不可能在家。
You
mustn't smoke while you are walking around in the woods. You could start a
fire.
在林子里走时一定不要吸烟，那样可能会引起火灾。
4．表示惊异、怀疑、不相信等态度，主要用于否定句和疑问句中。
How can
you be so careless
你怎么这么粗心？
Where
can could they have gone
他们会去了哪里？
He
can'tcouldn't be over sixty.
他不可能超过60岁。
5．Could可以用在虚拟条件句中。
If I
could fly, I should be very happy.
如果我能飞，我会很高兴。
If you
had followed my advice, you could have finished it.
如果你当时听我的，你早就做完了。
If you
had tried harder, you could have passed your exam.
如果你再努力些，你就能通过考试了。
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