order to,to,that,in order that的区别,

1、for the purpose of
Many people run for the purpose of losing weight.
5许多人为了减肥而跑步.
2、with the purpose of
He went to town with the purpose of buying a new television.
他进城的目的是买一台新电视机.
3、for the sake of 为了.起见
I stopped smoking for the sake of my health.
为了我的健康起见我戒烟了.
We ought to study hard for the sake of our motherland.
我们应该为了我们的祖国而努力学习.