1. If they dont come here, we wont be happy
2.We will go to the picnic if we have much free time
3.Everyone can eat inside if it rains
4.Unless Iam busy, I will go sightseeing you
5.if chidren go near the Nick'dog , it will be bite them
6.She will take the photos, she has camera
7.I will wirite the letter for you if i know the address
8.If he is good at all subjects, his parents will be satisfied