Complete the sentences, using if or unless
we can't play golfit stops raining
they beat this team,they will win the ournmet,
you can't go skydivingyou're afraid of heights
it rains, the match will be cancelled
we can't go to the fotball gameit's on friday because i have a tennis lesson
you're over 18, you can't enter the competiotion
И ОБЪЯСНИТЕ, ПОЧЕМУ ВЫ ПОСТАВИЛИ if ИЛИ unless