A. Why is it important to study planets?

 If we study planets, we can get information about science so it will be easy to understand science. ---> If we study planets, we can get a lot of information about science, so it will be easy for us to understand science.​

=> Corrected : The sentences are corrected grammatically.

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- 그는 뚱뚱하지 않아.

He is not fat.✔

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- 난 돈이라면 지긋지긋해.

Money is bored.​ Corrected pattern=>​ I'm sick of money. ​

- 난 매우 기뻐.

I am very happy.​ Corrected pattern=>​ I'm so glad.