This book is her's, not your's.
What is: This book is hers, not yours.
After the movie, the boys forgot (there, their) popcorn.
their
Its a great day to be outside.
What is: It's a great day to be outside.
Most of the events at the car show were fun, but Alfreds events were somewhat boring.
What is: Most of the events at the car show were fun, but Alfred's events were boring.
There are dogs, cats and goats roaming the farm.
What is: There are dogs, cats, and goats roaming the farm.
I love what you have done to (you’re, your) house!
your
It's campus is beautiful, and its quiet there.
What is: Its campus is beautiful, and it's quiet there.
I love to eat strawberries, especially when (their, they’re) sweet.
They’re
Most of the girls displays were organized, but Bobs display was a mess.
What is: Most of the girls' displays were organized, but Bob’s display was a mess.
When she went to the store she forgot her purse.
When she went to the store, she forgot her purse.
I want to go to the movies and the park, so I don’t (know, no) (witch, which) one to pick.
know, which
The mother searched high and low for his keys shoes and bookbag.
What is: The mother searched high and low and looked hard for the toys. OR The mother searched high and low; she looked hard for the toys. OR The mother searched high and low, and(cc) she looked hard for the toys. OR The mother searched high and low. She looked hard for the toys.
Josh was excited that he (one, won) the game, so he (ate, eight) a (whole, hole) pizza.
won, ate, whole
That is my and my sisters favorite song.
What is: That is my and my sister's favorite song.