Either Katelyn or Emma (IS or ARE) coming over after school.
IS
Sushi and ramen were on the menu. I was excited to see that it was on the menu.
Vague.
I was excited to see that on the menu. That could either mean sushi or ramen.
Some of the leaves has fallen off the tree.
Some of the leaves HAVE fallen off the tree.
Each of these books (IS or ARE) amazing!
IS
Everybody on the team celebrates.
Correct!
Everybody = singular
celebrates = singular
I loved my aunt. She always tells the best stories.
Clear. The pronoun I represents the speaker. The pronoun she represents the aunt.
Either Mrs. Olmstead or Mrs. Wilson eat at Chipotle.
eats
Either = singular
eats = singular
Some of my friends (HAS or HAVE) an FNL game on Friday.
HAVE
Incorrect.
EVERYBODY = singular
WERE = plural
Garvey and Edwin taught Cole a lot of meaningful lessons because he had also experienced a lot of anger.
Vague.
The pronoun he can be referring to any of the male characters: Garvey, Edwin, or Cole. When there are multiple males, use their name instead.
Addison and her went to see Taylor Swift.
Addison and she went to see Taylor Swift.
Her is an object pronoun, so it should only be used in the predicate of a sentence.
HIS/HER
Sara can't eat anything because she's sick.
Correct.
Clear.
Everybody want to come to the party.
wants.
Everyone in class (WAS or WERE) on time today!
WAS
When Penelope and Tahlia finally landed, she breathed a sigh of relief.
Vague.
She could mean either of the two girls.
He and her went to the basketball game on Friday.
He and she went to the basketball game on Friday.
or
They went to the basketball game.