1) If I finish my homework early, I will go for a walk with my friends.
2) If Mark wins this sport competition, he will be on TV.
3) Sam will come to the party if you invite him.
4) If Carol passes her exams successfully, she will enter the university.
5) She will be happy if she sees you.
6) I will stay at home if the weather is bad.
7) If he doesn't be a good singer, people wouldn't buy his CDs.
8) If Simon works hard, he will get a good job.
9) If I don't pass my exams, my father wouldn't buy me a new mobile phone.
10) If we leave now, we will arrive at the theatre early.
11) I will call the police if I see something unusual.
12) If you wear strange clothe, people will laugh at you.