1. He had an accident because the roads were very bad.
If the roads hadn't been so bad, he wouldn't have had an accident.

2. My brother cut his hand so he couldn’t play the game.
If he hadn't cut his hand, he could have played.

3. Untill you … (use) the right things, you … (hurt) yourself.
Until you used the right things, you would hurt yourself.

4. - What …(you/do) if you saw a homeless kitten?
- I …(take) it.
- What would you do if you saw a homeless kitten?
- I would take it.

5. - Hi, I’ll ride a bike now.
- If I …(be) you, I … (wait) an hour.
- If I were you, I would wait an hour.

6. If you …(not/put on) warmer jacket, you … (catch) a cold.
If you do not put on warmer jacket, you will catch a cold.
If you did not put on warmer jacket, you would catch a cold.
If you had not put on warmer jacket, you would have caught a cold.