be good at加名詞,介詞賓格或名詞性短語,很重要的就是如接動詞要加動詞的ing形式.
如I am good at teaching English.I am good at football.
be good at后面要接名詞、動名詞或名詞/動名詞短語，
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.
雙語例句：
1.You have to be good at spotting trouble on the way and heading it off.
你必須善于發現潛在的麻煩并加以化解。
2.A teacher should be good at drawing inferences about other cases from one instance.
老師要善于舉一反三。
3.Viruses tend to be good at surviving when a computer system crashes.
計算機病毒在系統崩潰后往往依然存在。