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