1.
1) I read this book last year.
2) John isn't watching NV now.
3) Tom played computer games at five o`clock yesterday.
4) I take the dog for a walk every day after school.
5) Jane was flying her kite while Bob was eating a sandwich.
2.
1) I've just joined the Art club.
2) She has worked at the clothes shop for 2 years.
3) Have you ever explored a haunted mansion?
4) Justin is cooking dinner for two hours now!
3.
1) If the weather is good, we'll go for a walk.
2) If I have time, I'll call you.
3) You will pass your exams successfully if you study hard.