31. A man answered the phone. He said Tom was out. 32. 7.05 is the time. My plane arrives then. 33. Max isn’t home yet. That worries me. 34. Do you know the building? The windows of the building are painted green. 35. Last week I went to see the house. I used to live in it. 36. I don’t know the girl’s name. She’s just gone into the hall. 37. Be sure to follow the instructions. They are given at the top of the page. 38. Hoan Kiem lake is a historical place. Its water is always blue.

1. A man answered the phone. He said Tom was out

⇒ A man who answered the phone said Tom was out.

2. 7.05 is the time. My plane arrives then

⇒ 7.05 is the time when my plane arrives.

3. Max isn't home yet. That worried me

⇒ Max isn't home yet, which worried me.

4. Do you know the building?nThe windows of the building are painted green

⇒ Do you know the building the window whose windows arw painted green.

5. Last week I went to see the house. I used to live in it

⇒ Last week I went to see the house where I used to live.                                                 

6. I don't know the girl's name. She's just gone into the hall

⇒ I don't know the name of the girl who has just gone into the hall.

7. Be sure to follow the instructions. They are given at the stop of the page

⇒ Be sure to follow the instructions which are given at the stop of the page.

8. Hoan Kiem lake is a historycal place. Its water is always blue

⇒ Hoan Kiem lake whose water is always blue is a historical place.