用if将两个句子合并成一个句子.(麻烦写下原因) 急呐~

题目

用if将两个句子合并成一个句子.(麻烦写下原因) 急呐~
a.i think you should take more exercise
b.you will be much healthier .
________________________________
a.she is goiing to eat more fruits and vegetables.
b.she will not be heavy .
________________________________
a.you are going to bring some food to the party .
b.the teacher will take it away.

答案

1i think if you should take more exercise,you will be much healthier .
2if she is goiing to eat more fruits and vegetables,she will not be heavy .
3if you are going to bring some food to the party ,the teacher will take it away.
2,3可以主句,从句颠倒,去掉标点.she will not be heavy if she is goiing to eat more fruits and vegetables