我把杯子碰倒了用英语怎么说,

I knocked down the cup.
或
I knocked over the cup.
参考：
请不要把那些罐子碰倒.
Please don’t knock down all those cans.
瓶子不可能自己倒下来,一定是有人碰了它.
The bottle couldn't have fallen down of itself.Someone must have knocked it over.