Ex 1:

1,It is said that they bought this shop last year

  They are said to have bought this shop last year

2,He asked me how much I thought it would cost

3,Mr.Brown whose team has lost the game  is very sad

4,Because it rained heavily,we were late for school

5,She said that she was working in a restaurant,and didn't care much for it

Ex 2:

1,If it not rain tomorrow,I will go camping with my friends

2,If I meet alien from outer space,I will invite them to home and talk

3,I have never travelled by air

4,The students are studying for exam now

5,It is such as a cold day,so we decide not to go out

=>
I/
1. It is said that they bought this shop last year.
They are said to have bought this shop last year.
2. He asked me how much I thought it would cost.
3. Mr.Brown whose team has lost the game looks very sad.
4. Because it rained heavily, we were late for school.
5. She said that she was working in a restaurant and didn't care much for it.

II/
1. If it doesn't rain tomorrow, I will go camping with my friends.
2. If I met an alien from outer space, I would invite him it to my home and to talk.
3. I have never travelled by air.
4. The students are studying for exam now.
5. It was such a cold day that we decided not to go out.