Andy-Lee

1.  你应该知道饭后不能立即去游泳。
you should know better than go to swimming after dinner.
2. 你年纪足够大了，应该知道不该把钱全花在买衣服上。
your old enough,should know better than spend all the money on the clothes.
3. 我知道不能借钱给他去赌博。
I know better than lend tim money to gamble.