be good at后面常接一些学科或者是用-ing形式表示的事情（加名词或者动名词）。
例句
What helps you to be good at sport?
是什么让你擅长运动？
I just want to be good at something.
我只是想有一项专长。
You must be good at learning at first.
你必须首先擅长学习。
He is said to be good at oral English.
据说他擅长英语口语。
So I think I will be good at this job.
所以我想我会做好这份工作。
