be good at后面加什么时态

　　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：

　　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。

　　A teacher should be good at drawing inferences about other cases from one instance.

　　老师要善于举一反三。

　　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。