Emma's homework:
I love a christmas!
In vacation,I will go to the playground.
I am rest.

Correction:
I love a christmas!
Correct: I love Christmas!
Explanation: We need to capitalized specific name of events or holidays. We also need to avoid using the article  "a" before a specific noun.

In vacation,I will go to the playground.
Correct: Every vacation, I play at the playground.
Explanation: We need to choose the appropriate words or verb for our sentences.

I am rest.
Correct: I will take a rest.
Explanation: We need to complete our sentences with appropriate verbs for it.

COMMENT:
Hi, Emma!
Wow! You are very fast! Thank you for sending me your homework. You sentences are almost perfect. You need to take note of my corrections and avoid them next time. Please review our classes and try to make senetnces everyday. Please keep up the good work! I hope to see you again next meeting!
-Teacher Joanna