3. 不定式作目的状语时，其逻辑主语就是句子的主语，此时应注意人称一致。如果不一致，则需用动词不定式的复合结构，即for sb. to do sth.

　　The teacher opened the door for the students to come in.

　　老师打开门以便学生们进来。

　　4. 如果不定式所表示的动作与其逻辑主语之间是动宾关系时，要用不定式的被动语态结构。

　　We worked hard to be admitted into a key university.

　　我们为考上一所重点大学而努力学习。

　　二、结果状语从句

　　结果状语从句一般放在句子的末尾，通常由so that，so...that...，such...that... 引导。

　　1. so...that和such...that引导的结果状语从句

so＋ 形容词/副词 ＋that＋从句 形容词＋a(n)＋单数可数名词 many/few＋复数可数名词 much/little(少)＋不可数名词 such＋ a(n) ＋形容词＋单数可数名词 形容词＋复数可数名词 形容词＋不可数名词 　　He was so angry that he left the room without a word.

　　他如此生气，结果一句话也没说就离开了房间。

　　He runs so fast that no one could catch up with him.

　　他跑得那么快，没有人能赶上他。

　　She is so good a teacher that all of us love her.

　　＝She is such a good teacher that all of us love her.

　　她是一位如此好的老师，以至于我们都喜欢她。

　　There are so many picture­story books that the boy won't leave.

　　有那么多连环画书，这个小男孩都不想离开了。

　　He made such rapid progress that his teacher praised him.

他取得如此大的进步以至于他的老师表扬了他。