FOR

For主要跟在下面这些名词的后面：

* a check for (amount of money)
例句: She gave me a check for $50.
她给了我一张50块钱的支票。

* a demand for something
例句: Unfortunately, there wasn't enough demand for our product.
不幸的是，我们的产品市场需求不大。

* a need for something
例句: There is a real need for discipline in this class.
这个班级，没纪律不行。

* a reason for something
例句: I have a reason for doing that!
我这么做是有理由的。