Gloria: I'm- I'm 6th grade student.
Correct:  I'm-I'm a 6th grader.
Explanation: You can remove the word "student" and say "grader" instead.
The word "grader" refers to a pupil at school.

Gloria: You're-You're pretty
Correction: No correction.

Gloria: We're-We're people.
Correction: No correction.

Gloria:They're-They're rich.
Correct: No correction.

Gloria:He's-He's famous.
Correct: No correction.

Gloria: She's singer.
Correction: She's a singer.
Explanation: The indefinite article "a" is used to refer to a particular or certain
one of a class.

Gloria: It's beautiful
Correct: No correction.

Hello, Gloria! I am very much pleased to know that you're getting better and better when it comes to your sentences. Thank you for submitting your homework. Just take note of the simple corrections. Keep up the good work!

-Teacher Isabel