英语口语语法：名词和介词的组合之for和in

　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 wasnt 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。

　IN

In主要在下面这些名词后面：

* a rise in something

例句: There has been a rise in prices recently.

最近价格上涨了。

* an increase in something

例句: We have seen many increases in production levels.

我们看到生产水平有了很大提高。

* a fall in something

例句: There has been a fall in prices recently.

最近价格有了下降。

* a decrease in something

例句: We have seen many decreases in production levels.