JENNY:

My favorite food is peach.

CORRECT!

JENNY: I went to the beach last Sunday.

CORRECT!

JENNY: A leaf is fell on the tree.

CORRECT: A leaf fell from the tree.

>>Be mindful of the correct tense of the verb and its preposition.

JENNY: That means your a sister.

CORRECT: That means you're a sister.

>>'your' means belonging or relating to the person you are talking to while 'you're' is the short form of 'you are'.