汉译英:当我正在读书的时候，爸爸正在看电视。

While I was reading, my father was watching TV.

Father was watching TV, when i read a book.

Father is watching TV while i am reading.

保证准确！

my father is watching TV,while I am doing the homework

While I'm reading my father is watching TV

两种,第二种会很出彩的哦：
first: When/While I was reading,my father was watching TV.
second: I being reading,my father was watching TV.