I am, you are, I´m, you´re!

Watch a video on the verb "to be" and read the transcript below.  (Notice the contracted forms).

Here you have the transcrip:
I am Robin and I am a boy
I am Annabel and I am a girl
I'm Harry and I'm a boy
I'm Emma and I'm a girl
You are Harry and you are a boy
You're Robin and you're a boy
You are Emma and you are a girl
You're Annabel and you're a girl
She is Annabel and she's my sister
He is Robin and he's my brother
This is my sister
This is my brother
He is Harry and he's a boy
She is Emma and she's a girl
We are Robin and Harry and we're boys
We are Annabel and Emma and we're girls
You are Annabel and Emma and you're girls
You are Robin and Harry and you're boys
They are Annabel and Emma and they're girls
They are Robin and Harry and they're boys
And we are all friends!!!We are!