become
1.become后面不可接不定式，如不可说He became to like reading和She has become to be interested，该把第一句里的became改作began，第二句里的to be删去。
2.become（过去分词）可以用作形容词。例如：
- They were looking at an invisible star suddenly become visible.
- Mr Smith, now become a teacher, used to live here.
- He is become a teacher.
- I do not know what is become of him.
但第三句和第四句现在不很普通，通常用has become。
3.become是一时的动作，所以不可说He has become a teacher for five years，该说He became a teacher five years ago或It is five years since he became a teacher。
4.下面各句里的become都用得不错，但不及用be普通：
- I want to become a doctor.
- I wish to become a doctor.
- I desire to become a doctor.
- I have aspirations to become a doctor.
- I am ambitious to become a doctor.
5.become不及get和grow通俗，尤其在属于比较级的形容词前面。下面各句里的got、grew、getting或growing如改成became或becoming，则句子比较不自然：
- I soon got tired.
- When it grew dark, we thought of coming back.
- They are all getting older.
- The sea is growing calmer.
6.become of作“发生于…”或“…成为”解。例如：What has become of him? （他成为怎样了？）这句子的主语总是what。
