I
1. If my brother has enough money, he will buy a bicycle
2 if i buy a new hat, i'll give it to you
3 if you ask the teacher, he will explain the lesson to you
II
1 if i had enough money, i could go on a long holiday this year
2 if i had a typewriter, i could type it myself
3 if i lives in a big city, i could go to the cinema very ofter
4 if Lan had a bike, she could ưalk to school