be good at 后面要加ing吗？

be good at
v.擅长； 健； 精通； 熟谙
动名词形式，也就是动词ing形式
或者名词
be good at painting
be good at singing
be good at (playing) basketball
be good at soccer
【例句】

1. Viruses tend to be good at surviving when a computer system crashes.
计算机病毒在系统崩溃后往往依然存在。
2. You need manual dexterity to be good at video games.
玩好电子游戏手要灵巧。
3. You have to be good at spotting trouble on the way and heading it off.
你必须善于发现潜在的麻烦并加以化解。
4. A teacher should be good at drawing inferences about other cases from one instance.
老师要善于举一反三.
5. But you had to be good at math.
但是你数学一定很好.

加，因为介词后面用ing

不要加，因为没有like

要

不要