7. If he didn't smoke forty cigarettes a day, he wouldn't cough a lot
8. If they had a garden, they would grow vegetables
9. If I had a boat, I would sail around the world
10. If I was rich, I would live in a big house
11. If I knew his address, I would give it to you
12. If he worked slowly enough, he wouldn't make so many mistakes
13. If I weren't sent to prison, she wouldn't visit me (passive - am not sent - am/is/are + V3)
14. If I won a big prize in a lottery, I wouldn't give up my job
15. If he wasn't so late, he could see many patients.

• The Zero Conditional:  

  Sự thật, điều hiển nhiên

  (if + present simple, ... present simple)
  If you heat water to 100 degrees, it boils.
• The First Conditional:
  

  Điều có thể xảy ra ở hiện tại

  (if + present simple, ... will + infinitive)
  If it rains tomorrow, we'll go to the theatre.
• The Second Conditional:
  

  Điều không thể xảy ra ở hiện tại

  (if + past simple, ... would + infinitive)
  If I had a lot of money, I would travel around the world.
• The Third Conditional
  

  Điều không xảy ra như mong đợi trong quá khứ

  (if + past perfect, ... would + have + past participle)
  If I had gone to bed early, I would have caught the flight.
  By RoseanneParkBLINK
  Best wishes ^>^