do good to和be good for（记住有时候be）

Good 后面用介词to还是for呢，很多同学以为他们可以互换，其实是不对的，因为good有不同的含义，后面接的介词也会不一样，而且to 和for的意思也有差别，那我们要怎么区分呢？

下面先看一个小故事吧：

A man was troubled by mice, they ran about all over his house at night, in the daytime,they just stayed under the floor.

一个男子深受老鼠困扰, 晚上老鼠在他的房子里到处跑, 而白天, 它们却藏在地板底下。

The man thought,”what I need is a cat that can catch mice.” He knew if a man who had cats for sale. So he went to see him. “Do you have a cat that is good for the mice?” he asked the man,”well,yes,I do have a cat that is good to the mice,” replied the man.”I’ll take it”,said the first man.

男子心想: "我需要的是一只能捉老鼠的猫。他知道有一个人有猫出售，因此他决定去拜访他，他询问那个男子：“你有能抓老鼠的猫吗？”男子回答说：“嗯，当然有，我恰好有有一只对老鼠好的猫”，男子说：“好吧，那我就要这只猫了”。

He paid for the cat and took it home. A week later,the cat didn’t catch any mice,but it played with them like old friends. So the man went back again with the cat under his arm. They had a quarrel because they both took the meaning of “good” as they need.

他花钱买了那只猫, 把它带回家了。一个星期过后，这只猫并没有抓过一只老鼠，却像老朋友一样跟那些老鼠一起玩。因此，男子怀抱着这只猫打算回去买猫人那里问清楚，他们吵了一架，因为他们都把对方的“good”理解错了。

文中出现的有关GOOD的两个关键句，我们分别来理解一下：

Do you have a cat that is good for the mice? “你这有没有善于捉老鼠的猫？”

I do have a cat that is good to the mice. “碰巧我还真有一只对老鼠不错的猫。”

意思完全相反，难怪他们会最后吵起来...

其实，good表示“适合，有效，胜任”意思时，用be good for;

Good 表示“仁慈，善良”意思时，用be good to;

只表示“对...有益处”时，两者可以互换。

下面一起来看看这些句子哪些使用正确吧！

1 老太太对哪些男孩和蔼可亲。

The old lady is good to the boys. (√)

The old lady is good for the boys.(×)

2 这药对改疾病有效果。

The medicine is good to the disease. (×)

The medicine is good for the disease. (√)

3 约翰不适合这项工作

John is not good to the job.(×)

John is not good for the job. (√)

4 这条金链刚好与吉姆的手表相配

The gold chain was just good to Jim’s watch.(×)

The gold chain was just good for Jim’s watch. (√)

5 体育运动有益健康。

Athletic sports are good to your health. (√)

Athletic sports are good for your health. (√)