8 >>> Rewrite the sentences using If and should or shouldn't. 1 You need to study more to get better grades. If you want to get better grades, you should study more. 2 It's not a good idea to stand under a tree during a storm. If there's 3 You need to do exercise to stay healthy. 4 Don't use the lift when there's a fire in the building. 5 When it's sunny, always use sun cream. ord some 6 When you have a fever, it's not a good idea to go to school.​