be good at后面加动词的ing形式。
例句
I was good at sums at school.
我上学时擅长算术。
Im not very good at drawing.
我不擅长绘画。
I\'m not very good at singing.
我不很擅长唱歌。
She\'s good at art and design.
她擅长美术和设计。
Fishing is good at high water.
高水位有利于钓鱼。
He wasn\'t any good at French.
他的法语糟透了。
