Область исследования естественных наук Естествен-ные наукиОбъект исследованияПредмет исследованияБиологияГеографияЖивая природаФотосинтез, пищевые цепи, прогноз массового размножениявредителей и т. д.Природа в целом, Горные породы, свойства мор-человеческое общество |ской воды, производство това-ров народного хозяйства, рас-селение населения Земли и др.Неживая природаСвойстватвердых веществ, электрический ток, скоростьветра, строение атомов и др.Неживая природаСвойства кислорода, производ-ство серной кислоты, смесии растворыЗвездное небоКосмические тела и процессыФизикаХимияАстрономия

1. If I had brother, he would help me.
2. If I have envelopes, I will give you them.
3. If he had a strong character, he wouldn't act like that.
4. If she were in a good mood, she would not be silent.
5. If this story was finally over, everyone would be very happy.
6. If something happened to them, they would tell us about it.
7. If the weather was good, we would go out of town.
8. If I needed the help of my colleague, I would call him by phone.
9. If she preferred this person to everything else, she would tell him about it.
10. If he offered her to go abroad, she would agree.
11. If they decided to postpone the meeting, they would tell us about it.
12. If he were interested in renewing his contract, he would not say such things.
13. If she were right, we would follow her advice.
14. If we were allowed to participate in this talk show, we would not have failed.
15. If we could solve this question, we would be free tomorrow.
16. If I had to answer this question, I would not find the right answer.
17. If she weighed 10 kilos less, she would feel much better.
18. If he had to work in our company, it would not last long.
19. If he needed to find out the truth, he would do everything from indefence.

This scar is not good for winter, is it?
I am your friend, aren't I?
They have got a lot of warm clothes, haven't they?
We haven't got any time to go shopping today, have we?
You can't put on your sandals in this cold weather, can you?
There are not any trainers in the shop, are there?
Your clothes must always look nice, mustn't it?
Sarah will put on her new dress to the party, won't she?
We can't look good in jeans and sweaters in the theater , can we?
Jim was a good-looking man, wasn't he?
His clothes were old-fashioned and boring, weren't they?
There were some boots under the bed, weren't they?
You must wear clean and neat clothes, mustn't you?
It is important to buy warm clothes for winter, isn't it?