1．主谓关系
The
future to greet us will be bright.我们的未来会十分美好的。
He is
always the first person to come and the last one to leave. 他总是第一个来最后一个离开。
The next
train to arrive was from New York.下一列到站的火车是从纽约开来的。
2．动宾关系
On
Sundays, he always has a lot of letters to write.星期天，他总是有许多信要写
The
teacher left us a lot of problems to solve.老师给我们留了许多道题要解答。
He can
find no one to make friends with.他找不到可交朋友的人。
注意：由于动词不定式与其修饰的词之间往往有动宾关系，因此，如果该不定式是不及物动词，其后应有必要的介词。
She has
a child to take care of.她有一个孩子要照看。
There is
nothing to worry about. 没什么可担心的。
He has
no friend to depend on.他没有可依靠的朋友。
I've got
a lot of things to see to this morning.
今天上午我有许多事情要处理。
3．同位关系
He broke
his promise to write to his parents regularly.他没有遵守诺言定期给他父母亲写信。
We
students should have the courage to face any difficulty.我们学生应该有勇气面对任何困难。
I have
no wish to quarrel with you.我不想和你吵架。
4．修饰关系
Now it
is time to begin our class.现在是上课的时间了。
I need
somewhere to take a nap.我需要一个地方打个盹。
Is that
the way to open the can那就是打开罐头的方法吗？
F．动词不定式作状语
不定式作状语可以表示行为的目的、结果、原因、条件等。
1．表示目的
I'm
saving up to buy a computer.我在存钱买电脑。
To save
the child, he laid down his life.为了救那个孩子，他献出了生命。
注意：有时为了强调或突出这种目的，也可以用in
order (not) to do,和so as (not) to do结构（so
as to do不可以置于句首）。
He
shouted and waved in order to be noticed.为了吸引注意，他又嚷嚷又挥手。
I'll
write down his telephone number so as not to forget it.我要把他的电话号码记下来，以防忘记。
2．表示结果
He got
to the station only to find the train had gone.他赶到车站，发现火车已经开走了。
What
have I said to make you so angry我说了什么话使你气成这样？
After
the meeting, they parted, never to see each other again.散会后，他们分手了，从此再也没有见面。
必背：不定式表示结果常见于下列句型。
1）so
... as to do
Would
you be so kind as to lend me your bicycle把你的自行车借给我好吗？
2）such
... as to do
We are
not such fools as to believe him.我们还没蠢到竟会相信他。
3）enough
to do
He
didn't run fast enough to catch the train.
他跑得不够快,没赶上火车。
4）only
to do
He
lifted a rock only to drop it on his own feet.他搬起石头砸自己的脚。
5）too
... to do
His
eyesight is too poor to read such small letters.她的视力太差了，不能看这么小的字。
注意：too...to...结构中的形容词如果是eager,
pleased, happy, ready等，动词不定式不表示结果，也没有否定的意思。
The boy
was too eager to get a geography book.那个男孩非常急切地想要得到一本地理书。
He is
too anxious to know the examination results.他很急切地想知道考试结果。
3．表示原因
I was a
fool not to listen to you at that time. 我当时不听你的话，真是傻瓜。
She wept
to find him in such a difficult situation.看到他处于这么困难的情形，她哭了。
4．表示条件
A man
would be blind not to see that.一个人如果看不到这点，那他就是瞎子。
How can
you catch the train to start so late这么晚才动身，你怎么能赶上火车？
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