用if或unless将下列每组句子合并成一个句子

题目

用if或unless将下列每组句子合并成一个句子
1.My dog will bark.It sees a stranger.
2.You give her a gift.She will be very happy.
3.You will get fatter.You exercise more.
4.It rains.We will go to the beach.
5.We can have a camp.The weather gets better before Sunday.

答案

1.My dog will bark if it sees a stranger.
2.She will be very happy if you give her a gift.
3.You will get fatter unless you exercise more.
4.We will go to the beach unless it rains.
5.We can have a camp if the weather gets better before Sunday.