1.单词：

chemistry化学,  computer technology计算机技术,  

be good at擅长,  be not good at不擅长.

2.

I am good at …….

我擅长......

I am not good at ……..

我不擅长......

I am good at computer technology.

I am good at math.

I am not good at chemistry.

I am not good at Chinese.

3.

Are you good at …….?

你擅长......?

Yes, I am/No, I am not.

是的，我擅长。/不，我不擅长。

Are you good at science?

Yes, I am.

Are you good at music?

No, I am not.