点动词与延续性动词的变化规则
短暂性（终止性）动词变延续性动词
1、buy---have borrow—keep
2、用be替代become
3. 用“be＋形容词”代短暂性动词
1、marry-- be＋married
2、fall (get) ill---be＋ill
3、die ---be＋dead
4、leave---be away （from）
5. start/ begin---be on
6. return ---be back
7. come ---be here 8. go—be out
9. arrive --- be here/be in
10. join --- be a member of + 组织
---be in + 组织
点动词可用于完成时，但不与段时间连用
The old man has died for five years.（错误）
改法----1. 改动词，留时间
The old man has been dead for 5 years.
-----2. 留动词，改时间，改时态
The old died 5 years ago..
----3. 改句式
It is 5 years since the old man died.
