that

I read a book.

私は本を読みます

I read a book today.

私は今日、本を読みます

I read a book at the library today.

私は今日、図書館で本を読みます

I read a book at the library with my friend today.

私は今日、図書館で友達と本を読みます

I read that book at the library with my friend today.

私は今日、図書館で友達とその本を読みます