good at后面不是加动词原形,应该跟动词ing形式。因为at是介词,介词后面要跟名词或动名词即动词的ing形式例如be good at doing sth是擅长做某事。动词ing形式也是一种非谓语动词。
good at后面加sth.或者doing sth。be good at的具体用法如下:
1、be good at sth. 擅长某事
I am good at Chinese.
我擅长中文。
He is good at maths.
他擅长数学。
2、be good at doing sth. 擅长做某事
I am good at playing volleyball.
我擅长打排球。
They are good at playing the guitar.
他们擅长弹吉他。
1、I'm not very good at drawing.
我不擅长绘画。
2、I'm not much good at tennis.
我不太擅长打网球。
3、He's good at making things with his hands.
他善于手工制作物品。