1. If they had dealt with the matter properly in the first place, they wouldn't have had a lot of problems.
2. If my current salary was as high as yours, I could afford to rent that flat.
3. If Sara had gone to Spain last summer, she would have had a chance to brush up her Spanish.
4. Your neghbour cut down another apple tree near your house because you hadn't taken him to court a long time ago.
5. Unless you have an excellent command of English, you won't get his job.
6. If my brother won enough money in a lottery, he would go on a round-the-world trip.