Дайте форму минулого часу для підкреслених дієслів у теперішньому часі: 1. He can communicate to native speakers quite well. 2. We are to return at 7 p.m. (We’ve got equipment 3. She has to work at home today. 4. Student must be attentive at lessons. 5. We are to carry on an experiment. 6. Scientist must use new methods in their research. 7. All students of our University must carry out a number of experiments in the laboratory. 8. I am to buy some new appliances.

1) could

2) had to

3) had to

4) had to

5) had to

6) had to

7) had to

8) had to

Объяснение:

Dear Paul,

Thank you for your letter! I'm glad to hear that you've passed your driving test! Congratulations!

I'm sorry I haven't written for such a long time. I've been really busy with my new project. By the way, thank you for your brilliant idea. I really had the best presentation last time. I really appreciated your advice.

As for your question, I think all you have to do is just regular exercises. Don't be lazy and try to find at least 20-30 minutes for your health every day. There is a rule of 30 minutes a day: if you do something at least 30 minutes a day you will have a result at the end of the week. For example, if you read 50 pages during this time, at the end of the week you'll have total of about 350 pages. If we say that we don't have enough time for it (as we usually do) we have 0 result at the end of the week. Besides, they say that it takes 21 days to form a new habit. So all you have to do is to take the bull by the horns and try it for just 3 weeks.

Unfortunately, I need to come back to my project. I hope my advice was helpful.

Hope to hear from you soon.

Take care,

Vitaly.

1) was watching, heard

2)found, were digging

3)was standing,saw

4)were working, went

5)was telling,rang

6)was driving, stopped

7)were having,heard

8)was watching, fell

Объяснение:

Past Continuous- где действие происходило длительное время( процесс)

Past Simple- где прерывается действие

She was watching  a documentary when she  heard the loud noise outside.- Она смотрела документальную передачу, как вдруг она услышала громкий звук снаружи.

watching и смотрела- процесс

heard и услышала - прервало её действие( а именно громкий звук)

Объяснила как смогла, надеюсь понятно! Удачи! ;)