1) if Susan passes his exam parents will buy her a New mobile
2) Mary will be late for classes ( или Mary is late for classes) - контекст не понятен, поэтому и время непонятно какое ставить
3) If Jim learns to be polite
1) if Susan passes his exam parents will buy her a New mobile
2) Mary will be late for classes ( или Mary is late for classes) - контекст не понятен, поэтому и время непонятно какое ставить
3) If Jim learns to be polite