​Q:Where do you want to go, if there's no corona virus? Why?

A: I want to go to the amusement park with my friends. Because it must be fun.

=> I want to go to the amusement park with my friends. I think it will be fun. => Corrected: The sentence is corrected grammatically.​​

-비가 왔거든.

It was rain. => Because it was rainy? => Corrected: The sentence is corrected grammatically.​​​

-그래서 뭐했니? 집에 돌아왔니?

So what did you do? Did you come back to home? => Then, what did you do? Did you go back home? => Corrected: The sentence is corrected grammatically.​​​

-응, 그랬어.

Yes I did. (correct)​