2. He's not sick so he's not going to stay home today.
→ If he was sick, he would stay home today.
3. The firemen arrived on time so they saved the house.
→ If the firemen hadn't rrived on time,they would not have saved the house.
4. We didn't leave yesterday because it snowed.
→ If it hadn't snowed, we would have left yesterday. 
5. I don't have the time so I'm not going to the beach with you.
→ If I had the time, I would go to the beach with you.
6. He won't tell you about it because he's not here.
→ If he were here, hw would tell you about it.
7. He speaks very quickly so you can't understand him.
→ If he didn't speak  very quickly, you could understand him.
8. We didn't know that you were there so we didn't write you a letter.
→ If we knew that you were there, we would write you a letter.
9. She didn't sell the house because she didn't find the right buyer.
→ If she had found the right buyer, she would have sold the house.
10. We lost our way, we didn't arrive early.
→ If we had arrived early, we would not have lost our way.
11. The mechanic is repairing Ann's car.
→ Ann's car is being repaired by the mechanic.
12. We must do something before it's too late. (Passive voice)
→ Something must be done before it's too late.
13. They ate all the food before we got to the party. (Passive voice)
→ All the food were eaten before we got to the party. 
14. He has spelt this word wrongly. (Passive voice)
→ This word was spelt wrongly.
15. Nick will bring the pizzas to our house. (Passive voice)

→ The pizzas wil be brought to our house by Nick.
16. They were cleaning the floor when I arrived. (Passive voice)
→ The floor was being cleaned when I arrived.

#NOCOPY

- Number one-