At 3 o'clock yesterday afternoon they were reading a book (Past Cont.) He is reading a book right now (Present Cont.) This time next week, I'll be reading a book (Future Cont.)
She had read a book by 5 o'clock in the afternoon. (Past Perf.) She has bought a new book (Present Perf.) They will have finished their meeting by 5 o'clock (Future Perf.)
He is reading a book right now (Present Cont.)
This time next week, I'll be reading a book (Future Cont.)
She had read a book by 5 o'clock in the afternoon. (Past Perf.)
She has bought a new book (Present Perf.)
They will have finished their meeting by 5 o'clock (Future Perf.)