In july,she flown to America to begin to work.to begin to work.这里的不定式是做什么语（比如状语啊~）1.在什么情况下要用不定式,是不是如果要在一句话中说两个动词,就可以用不定式.2.不定式有什么用途啊

to begin to work目的状语.两个动词连接可以用不定式,也可以用动名词,不能一概而论.
不定式的用法很多,以下简单举例,如需详细再联系或查语法书.
1.不定式（短语）作主语
To improve our teaching method is very important.
改进我们的教学方法是非常重要的.
2.不定式（短语）作表语
His ambition is to become a successful scientist.
他的抱负是要成为一名成功的科学家.
3.不定式（短语)作动词宾语
They decided to change their mind.
他们决定改变主意.
5.不定式（短语）作宾语补足语
My English techer advised me to buy a better dictionary.
我的英语老师建议我买本好一点的词典.
6.不定式（短语）作主语补足语
The room was found to be empty.
那个房间被发现是空的.(to be 是主语补语)
7.不定式（短语）作定语
The next train to arrive was from New York.
下一列到站的火车是从纽约开来的.
8.不定式（短语）作状语
(1) 作目的状语
Every morning he gets up very early to exercise.
每天早晨他早早起床去锻炼身体.
(2) 作结果状语
A few years later we came to our home to find that our home town had greatly changed.
几年后我们回到家里,发现家乡的面貌大大地改变了.
9.不定式（短语）可以作句子的插入语.
To tell the truth,the film was a great disappointment to me.
说实在的,那部影片使我大为失望.