be good at 怎樣運用

比較級:be better at

用法:

1、be good at sth.

擅長某事.

如:She is good at English.

她擅長英語.

2、be good at doing sth.

擅長做某事.

如:Mary is good at swimming.瑪麗擅長遊泳.

3、薩麗比邁克更擅長數學.

Sally is better at math than Mike.