ЭТО НА ВРЕМЯ travels has been travelling is travelling travelled The ... the house, the more expensive it is to heat. * big bigger bigger than biggest We ... in traffic while the workers were repairing the road. * wait were waiting had waited are waiting Sue of joining a community sharing programme. * is going to think will think is thinking thinks People are driving faster and ... with no regards for the speed limit. * more fast faster fastest fast Don’t you think the neighbours ... a bit strange these days? * are acting act acted had acted Paula isn’t here. She ... to school. * has been has gone had gone had been They ... the house before the tenants arrived. * clean were cleaning had cleaned have cleaned Carol a garden party this Saturday. * is having had has has had Someone behind me and now I can’t get my car out of the lot! * parks had parked has parked was parking This flat ... great; let’s rent it. * is looking looked looks has looked.

1. The new regulations will be announced in September.

2. Do they have their dogs walked every day?

3. She has the piano tuned twice a year.

4. The letter will be posted first thing tomorrow morning.

5. When Mr Cobert arrived at the office, he realized his computer had been stolen.

6. The photographs have already been developed.

7. It's worth having the car serviced.

8. She expects to win the November election.

9. They were having their garage painted when I called.

10. Your teeth is to be checked every six months.

Я думаю, через "self"

Объяснение:

В английском языке для обозначение действия с постфиксом -сь, -ся используются возвратные местоимения myself (я сам), herself (она сама) и пр.

К примеру: I need to take care of myself (Мне нужно позаботиться о себе). В подобных предложениях не всегда при их переводе будет слышен -сь, -ся, т.к. часто он не звучит или так нельзя сказать.

Например: She did her homework herself (Она сделала свою домашнюю работу сама). Тут уже не скажешь "Она сделалась свою домашнюю работу". "Сам(а)" звучит намного лучше :)

Посмотри таблицу подобным местоимений в интернете (существуют определённые различия в написании и использовании).

Пы.Сы. self ещё используется при словообразовании (self-development - саморазвитие).