-기분이 어떠니?

How are you feeling?

=> Another way: Your sentence is okay and this is another way of saying it.

​How do you feel?

-조금 떨려.

Im a little of shake. --> I'm a little bit nervous.

=> Corrected : The sentence is corrected grammatically.

​

-언제 돌아오니?

When are you come back? --> When will you come back?

=> Corrected : The sentence is corrected grammatically.

​