不定式常可用作状语，表示：
1．目的：
He went out to buy a paper．
他出去买报纸去了。
We’ve come to learn from you．
我们是来向你学习的。
They’re working hard to fulfill the plan．
他们在努力完成计划。
To succeed，we must make good preparation．
要取得成功必须做好准备。
2．结果：
What have I said to make you so angry?
我说了什么话使你这样生气?
He left，never to return．
他走了再也没回来。
She lived to be ninety．
她活到了九十岁。
The curtain parted，to reveal a market scene．
幕开了，露出了集市场景。
3．原因：
I am sorry of hear it．
听了这我很难过。
She was surprised to see him．
看到他她很吃惊。
We are proud be young people of China．
作为中国青年我们感到自豪。
They jumped for joy to hear the news．
听到这消息他们高兴得跳了起来。
4．在某方面等：
She is always ready to help others．
她总是乐于帮助人。
We were eager to take part in the work．
我们都亟于参加这项工作。
Be careful not to catch cold．
当心别感冒。
The girl is easy to get along with．
这姑娘很容易相处。
不定式还可在某些句型中使用：
She was too young to understand that．
她年纪太小不能理解这个。
We had enough food to last a week．
我们有足够的食物维持一礼拜。
Let’s walk faster,so as to catch the bus．
咱们走快点好赶上车。
We went by car in order to save time．
我们坐车去以节省时间。
不定式还可修饰全句，说明说话人的态度：
To be frank，I don’t trust him．
坦白说我不信任他。
To tell you the truth，I don’t like the plan．
说老实话我不喜欢这个计划。
