(1). Past Simple or Past Perfect Simple:
1.He (to buy)__________a present after his friend (to invite)________him at his party.
2.Before she (to go out)_______she (to talk)_______on the phone.
3.After they (to have)______dinner,they (to watch)_______TV.
4.We (to listen to)_______the radio,after we (to find out )_______about the accident.
5.He (to meet) __________hir relatives before he (to go)_______ on holiday.
6.After the children (to help)______their parents, they (to play)_______outside.
(2).Past simple or Past Countinous:
1.Whwn the teacher (to come into)_______the dass,the children (to talk)_______.
2.Jane's car (to break)______down while she (to drive)_____to work.
3.We (to play)_______tennis when someone (to call)_______us.
4.I (to work)________hard on my essay when I (to have) _______a great idea.
5.While I (to wait)_______for you,I(to see)_______something strange.
6.Whil the customer (to count)_____the money,the shop assistent (to pack)______the present.