===CORRECTION===

Do Youn: I like playing the piano, drum, flute and guitar
Correct: I like playing the piano, drum, flute and guitar.
Explantion: Always end your sentence with a period.
Suggestion: You can also elaborate your ideas more by giving your own reasons why you like playing those instruments.

Example: I like playing them because it makes me feel relaxed and calm.

                                         ===NOTE===
Hi Do Youn! Thank you for submitting your homework! Just always remember to follow the corrections being made and don't forget them anymore for your sentence constructions. I'll see you again next week! Take Care :) Bye! ~Teacher Carrie