比一比  辨一辨

1. be good for意为“有益于……”、“对……有好处”，后接代词、名词或v-ing形式。其反义词组为be bad for，意思是“对……有害”。其中，for表示“对于”、“就……而论”，其后接名词、代词或v-ing形式作宾语。如：

Eating well and exercising regularly are good for our health. 良好的饮食和经常性的锻炼对我们的健康有益。

This food is bad for children. 这种食物对儿童有害。

Vegetables are good for people. 蔬菜对人们有好处。

This kind of wood is good for making boxes. 这种木材适合做箱子。

2. be good at 意为“在……方面好”、“擅长于……的”，后面接名词、代词或v-ing形式。如：

They are good at English. 他们擅长英语。

Are you good at singing? 你擅长唱歌吗？

Some people are very good at dancing. 一些人很擅长舞蹈。

3. be good to 是“对……友善”的意思，后面通常接人。如：

Our English teacher is always good to us. 我们的英语老师总是对我们很好。

The old man and his daughter are very good to the child. 那位老人和他的女儿对那个小孩很好。

Be good to elder people. 要善待年长者。

[牛刀小试]

请选用be good for, be good at和be good to三个短语的适当形式填空。

1. They ________ me when I was ill.

2. Milk ________ children.

3. She ________ English and Math.

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