They are apples.
They're apples.
You are a good friend.
You're a good friend.
He is not happy.
He isn´t happy. / He is not happy
I am sick.
I'm sick
It is a brown dog.
It's a brown dog.
She is a girl.
She's a girl.
He is a firefighter.
He's a firefighter.
It is Monday.
It's Monday.
I am thirteen years old.
I'm thirteen years old.
He is a teacher.
He's a teacher
They are not from Russia
They aren´t from Russia.
He is in the classroom.
He's in the classroom.
She is going to eat.
She's going to eat.
They are going to school.
They're going to school.
You are nine years old.
You're nine years old.
We are at home.
We're at home
He is not Spanish
He isn´t Spanish.
Montevideo is not clean.
Montevideo isn´t clean