319　be good at，be good to，be good for和be weak in

① be good at意为“擅长，长于”，相当于 be strong in。

He is good at figures. 他善于计算。

She is good at music but poor in drawing. 她擅长音乐，但拙于绘画。

This cat is good at catching rats. 这只猫很会捉老鼠。

I am sure she will be very good at her major. 我坚信她的专业课会学得很不错的。

② be good to意为“对……好，对……态度好；在……方面好”。

Chicken soup is good to the taste. 鸡汤的味道好。（=Chicken soup is nice to taste.）

A father should be good to his children. 父亲对孩子应该慈爱。

③ be good for意为“有益于；对……有效；胜任”。

It is good for the health to take a walk in the morning. 清晨散步有益于健康。

This licence is good for one year. 这张执照有效期是1年。

The little boy is good for another two miles. 这小男孩还能再走两英里。

提示

①be good of sb. to do sth. 表示“某人做某事好……”。

It is good of you to help me out. 多谢你帮我渡过难关。

②同at连用的短语：

be bad at 拙于……

be clever at 善于……

be quick at敏于……

be slow at 拙/钝于……

be poor at拙于……

④ 同in连用的短语：be skilled in，be skillful in，be adroit in，be dexterous in，be proficient in等，表示“熟练于……，擅长……，精通于……”。但be weak in表示“弱于……”。

Henry is proficient in most sports. 亨利擅长大部分运动项目。

He is weak in grammar. 他语法知识差。