我的爸爸在看书的英文翻译为：My father is reading a book.

reading：

n.阅读;读书活动;宣读;读本;读物;阅读材料；

v.识字;阅读;读懂;读;朗读;读到;查阅到；

read的现在分词

复数： readings

Are you any good at map reading?

你会看地图吗？

The results of the survey made fascinating reading.

调查结果令人读起来饶有兴味。

I didn't want to say anything without actually reading the letter first.

在未确实读信之前我什么也不想说。

She gave a reading from her latest volume of poetry.

她朗诵了她最近出版的诗集里的一首诗。