Knock at the door before entering, please.

进来之前请敲门。

I was almost knocked down by a cyclist riding on the pavement.

我差点儿被一个在人行道上骑自行车的人撞倒。

These old buildings will sooner or later be knocked down.

这些老房子迟早得拆掉。

He was in such a hurry that he almost knocked into me.

他如此匆忙，差点儿撞到我身上。

If you buy more than ten, they knock 20 pence off the price.

如果买10个以上的话，他们会便宜20便士。

Roy’s father was knocked over by a car.

罗伊的爸爸被车撞倒了。