kpmazda

1.  你应该知道饭后不能立即去游泳。
you should know you cann't swim right away after eating
2. 你年纪足够大了，应该知道不该把钱全花在买衣服上。
you are old enough to know don't spend all the money on clothing.
3. 我知道不能借钱给他去赌博。
I know I cann't lend him money for gaming.