pay and pay for的用法

pay 是支付的意思,是动词
pay（……）for……是为……支付的意思,for表示为了.pay for之间可加支付的金额也可以不加　
1.Right,I'll pay for the food and you pay for the drinks.
好吧,我付饭菜钱,你付酒水.
2.pay three dollars for a hamburger; pay an hour`s wage
花三美元买了一个汉堡包；支付一小时的工酬
3.We is pay for the computer by pay instalment of 50 a month.
我们以每月50英镑分期付款支付这台计算机.

Let me pay for the broken window. 我来赔打破的玻璃窗。 3.因…受罚I