be good at加名词,介词宾格或名词性短语,很重要的就是如接动词要加动词的ing形式.
如I am good at teaching English.I am good at football.
be good at后面要接名词、动名词或名词/动名词短语，
例句：John is good at swimming and basketball.
It is important that we try to be good at everything we do.
I have a shrill voice. I'll never be good at singing.
I am good at chess, but not checkers.
双语例句：
1.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。
2.A teacher should be good at drawing inferences about other cases from one instance.
老师要善于举一反三。
3.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。