1.you eat lot of junk food,so you put on weigh.
-if you didn't ...
-were you...
-unless...
2.put on your sun hat,or you will have a sunburn.
-if you...
-should you..
-unless...
3.do more exercise and you can stay in shape.
-if you...
-should...
-unless...
4.having a healthy lifestyle is important.
-it's...
5.she last had allergy for 5 months.
-the last time...
-she hasn't....
-it's 5 months....