what are you doing now?的回答

I am doing my homework./I am reading a book./I'm playing basketball.可多可多了。你仿我的句子写吧。

I am 动词ing.动词如：打篮球play
basketball.

I am practicing volleyball.
I am exercixing
I am doing my homework.
I am reading a book.
I'm playing basketball

I'm thinking what you are doing now.

sb+be动词+动词ing（+名词或者是介词+地点或者是其它形式）

I am surfing on the Internet.我在上网。
I am answering your question.我在回答你的问题。