Use present perfect or past perfect): 1.i received a letter from susan a few days ago. i ……… to i receive) letters from her since she left. 2. there are a lot of dirty i dishes. we ………….(not to wash up) since morning. 3.i telephoned her after i …………(to think over) her offer. 4. he gave up smoking after he …………(to smoke) for 20 years. 5. how long you …………(to be engaged) before 1 you got married? 6. we ………….(to be) here since 10 o'clock. 7. at last he……….. (to finish) iris book. he ………… write) it for ten years.

1.i received a letter from susan a few days ago. i haven’t received letters from her since she left. 2. there are a lot of dirty i dishes. we haven’t   washed   up   since morning. 3. i telephoned her after i had thought over her offer. 4. he gave up smoking after he   had smoked for 20 years. 5. how long had you been engaged before   you got married? 6. we have been here since 10 o'clock. 7. at last, he has finished his book. he has written it for ten years.

the actors give good advice.

  1.do the actors give advice? (общий)

  2.who gives good advice? ( специальный, к подлежащему )

  3.what do the actors give? ( специальный )

  4.do the actors give good or bad advice? ( альтернативный)

  5.the actors give good advice,don't they? ( разделительный )

sara wants to be an actress. 

  1.does sara want to be an actress?

  2.who wants to be an actress?

  3.what does sara want to be?

  4.does sara want to be an actress or a writer?

  5.sara wants to be an actress,doesn't she?