A child was in hospital last night after being knocked down by a car.昨晚有个小孩被车撞倒后进了医院。The house is being knocked down to make way for a new road.这所房子正被拆毁以便为新建公路腾出地盘。The building is being knocked down.这座建筑物正被拆毁。He died in hospital after being knocked down by a car.他被车撞倒后死在了医院。