Gloria: I want to go red velvet's concert.
Correct: I want to go to the The Red Velvet's concert.
Explanation: The preposition "to" is used to indicate a direction, goal, or objective.The definite article "the" is used especially before a noun or nouns like people or things.

Gloria: I can sing.
Correct: No correction.

Gloria: composer can make song.
Correct: Composers can make songs.
Explanation: Always capitalize the first letter of your sentence.

*****************************************
*****************************************

Thank you for submitting your homework, Gloria! Just review the corrections. See you tomorrow, Gloria! Have a good sleep.

-Teacher Isabel