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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后面应该加什么
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。
3、be good at = do well in 擅长，......做得好
I am good at English.
=I do well in English.
我擅长英语。
good at的双语例句
1、A good listener must be good at asking questions.一个好的聆听者应该善于问问题.
2、Be good at harmonize social relationship between all departments, strong ability in communication.擅长协调部分之间人际关系,具有很强的沟通能力.
3、I expect to study in the US one day. Before that day coming, I must be good at English.我期望有天能到美国念书在那天到来之前我必须先将我的英文学好!
4、You could study astronomy, or space engineering, and be good at it.你可以学习天文学,或是空间工程学,可以学的很棒.
5、Wow, what a perfect girl! She must be good at flattering your GM.哇哦,好一个完美的女人啊.她一定很会拍你老板的马屁了.
6、He is good at playing piano. 他很擅长弹钢琴。