I bar her smoking.The doctor warned the patient against smoking.这两句里的smoke为什么用ing形式

问题描述:

I bar her smoking.The doctor warned the patient against smoking.这两句里的smoke为什么用ing形式
可以用原型smoke吗,

禁止某人做某事,bar smoking 是固定搭配,不可改,again是介词,后面必须跟ing,不可用原形,例如:stop somebody from doing something你能多举几个简单的介词+ing的例子吗?