In order to catch the early bus, she got up very early.
为了赶上早班车,她起得很早。
A group of young people got together to discuss this question.
一组年轻人聚在一起讨论这个问题。
She came to this city to visit her daughter.
她来到这个城市看望她的女儿。
(2)原因状语,多见于"sb.+be+adj.+to do..."结构句中。如:
I feel very lucky to have him.
拥有他我感觉很幸运。
(3)结果状语,多见于"too...to","enough to..."结构句中。如:
I’m too tired to do it well.
我太累了以至于做不好这件事。
The room is big enough for three people to live in.
这个房间三个人住足够大。
7. 动词不定式的复合结构
动词不定式的复合结构是"for / of sb. to do sth."。不定式复合结构的介词用for还是of,主要取决于前面形容词的性质。一般说来,of前面的形容词是careful, clever, foolish, good, kind, nice, wise等,说明人的特性;for前面的形容词是dangerous, difficult, easy, hard, heavy, important, interesting, necessary等,一般说明不定式动作的特性,前面如果是名词用for。如:
It’s a good idea for parents to allow children to study in groups during the evening.