The CEO was so busy as to forget his son's birthday.

对于不定式作目的状语，应注意以下几点：

例如：Let's hurry so as not to be late for school.

2．in order to引导的目的状语，可以放在 ，也可以放在 ；

We'll hold a meeting in order to/so as to/to explain the programme..

3．不定式作目的状语时，通常句子的主语就是它的逻辑主语。但如果不是的话，就要用" "结构表示逻辑主语。

This is a very difficult problem for me to solve.

这对我来说是个难题。

注意：在下列情况中，不定式结构有其自己的逻辑主语。

(1)bring，send, take，make（制作）,turn等动词的宾语之后。

　They sent a man to mend the window.

With Father's Day around the corner, I have taken some money out of the bank____ Presents for my Dad.

A. buy B.to buy C. buying D. to have bought

(2)to be done被动语态中。

He wants the file to be typed right now.

他想让文件立刻被打印出来。

4．only to do可有两层含义：一是" "表目的；二是表示" "的结果。

I come here only to say goodbye to you.(目的)

We hurried to the classroom only to find none there.(结果)

George returned after the war, only that his wife had left him.

A. to be told B. telling C. being told D. told

注意：不定式还可以作结果或原因状语：

(1)表结果

　He is old enough to make a trip alone.。

　It's too cold for you to work outside.

　The girl was so kind as to help the old man off the bus.

　I'm not such a fool as to believe that.

(2)表原因

You must be very happy to have found your lost car.

二、结果状语从句

　　结果状语从句常用so...that...，such...that...，so that三种形式来表示。

1．so...that...句型

(1)so＋ ＋that从句

He is so good that everyone loves and respects him.

I haven't seen Ann for long that I've forgotten what she looks like.

A.such B. very C. so D. too

　(2)so＋many/much(多)/little/few(少)＋ ＋that从句

There was so little food that everyone didn't have enough to eat.