龙楚红

1.  你应该知道饭后不能立即去游泳。
You know better  than to swim as soon as finished dinner.
2. 你年纪足够大了，应该知道不该把钱全花在买衣服上。
You know better than not to spend all the money on  clothes for your old age.

3. 我知道不能借钱给他去赌博。
I know better than not lend money to him.