If my friend copied in an exam, I would tell our teacher.
If my friend won a lot of money, I would congratulate him or her.
If I could buy a new mobile phone, I would buy Iphone 6.
If I met my favourite singer, I would ask him to sign an autograph.
If I had an aeroplane, I would fly to Hawaii.
If tomorrow was (were) a holiday, I would sleep until 12 o'clock.