A useful sentence for every beginner:
我还在学中文。
Wǒ hái zài xué Zhōngwén.
I’m still learning Chinese.
Try one longer sentence:
我还在学中文,所以我说得比较慢。
Wǒ hái zài xué Zhōngwén, suǒyǐ wǒ shuō de bǐjiào màn.
I’m still learning Chinese, so I speak a little slowly.
Or keep it simple: 我还在学中文。
Reply to one person with: 你呢?— And you?
If you want a correction, add: 请帮我改一下。