Переделайте в пассивный залог, : ) the scientists have not yet defined the origin of the name belarus. 2. all sorts of agressors attacked and occupied belarus many a time. 3. francisk skaryna started book-printing business in belarus in the 16th century. 4. the fascists cut down and burnt many belarusian woods during the years of world 'war ii. 5. the belarusian people restored the economy of the republic with the help of all peoples of the former soviet union. 6. the belarusian people celebrate independence day on the 3d of july. 7. belarusian industry produces tractors and automobiles, refrigerators and tv sets, computers and other goods. 8. the belarusian farmers cultivate grain, vegetables, herbs and flax. 9. in 1870 i. nosovic published the first dictionary of the belarusian language. 10. the russian and polish languages have greatly influenced on the belarusian language.

1. The origin of the name Belarus hasn't been defined by scientists yet.
2. Belarus was attacked and occupied by all sorts of aggressors many times.
3. The book-printing business in Belarus was started by Francisk Skaryna in the 16th century.
4. During the years of World War II many Belarusian woods were cut down and burnt by the fascists.
5. The economy of the republic was restored by the Belarusian people with the help of all people of the former Soviet Union.
6. The Independence Day is celebrated by the Belarusian people on the 3rd of July.
7. Tractors and automobiles, refrigerators and TV sets, computers and other goods are produced by the Belarusian industry.
8. Grain, vegetables, herbs and flax are cultivated by the Belarusian farmers.
9. The first dictionary of the Belarusian language was published by I. Nosovic in 1870.
10. The Belarusian language has been greatly influenced by the Russian and Polish languages.

Есть еще один вариант ответа:
If Peter HAD COME to my place, we WOULD HAVE GONE to play in the yard.
If Peter HADN'T COME to my place, I WOULD HAVE WATCHED TV.
If Frank’s parents HAD HAD their holidays in summer, they WOULD HAVE GONE to the seaside.
If they HAD HAD their holidays in winter, they WOULD HAVE STAYED at home.
If the fog HAD THICKENED, Harold WOULD HAVE PUT UP the tent for the night.
When I HAD FINISH my work, I WENT to the cinema.
We BOUGHT this book as soon as our mother HAD GIVEN us some money.
When we HAD COME to your place you SHOWED us your present.
I HAD RETURNED you your ring when you ASKED me.
I HAD WAITED for my friend until he CAME from the shop.
My father HAD STARTED writing before the sun ROSE.
As soon as you HAD FINISH your study I PRESENTED you with a new flat.

1 If Peter comes to my place, we will go to play in the yard.
2 If Peter doesn't come to my place, I will watch TV.
3 If Frank's parents have their holidays in summer, they will stay at home.
4 If the frog thickens Harold will put up the tent for the night.
5 When I finish my work, a I will go to the cinema.
6 We will buy this book as soon as our mother gives us some money.
7 When we come to your place you will show your presents.
8 I will return your ring when you ask me.
9 I will wait for my friend until he comes from the shop.
10 My father will start writing before the sun rises.
11 As soon as you finish your study I will present you with a new flat.