Написать предложение I often read a book

1) I often read a book — Pr. Simple2) I am reading a book now — Pr. Cont.3) I have read a book by 12 o'clock — Pr. Perf.4) I have been reading a book since morning — Pr. — Perfect Cont.5) I read a book yesterday — Past Simple6) I was reading a book at 5 o'clock yesterday — Past Cont.7) I had read a book by the time mum came back — Past Perf.8) I had been reading a book for 2 hours by the time mum came back — Past Perf.- Cont.