2. You're
3. He's
4. We're not
5. She's not
6. Stell's not
7. They've got
8. The boy's got
9. I've not got
10. The girl's not got

I am -> I'm
You are -> You're
He is -> He's
We are not -> We aren't
She is not -> She isn't 
Stell is not -> Stell isn't
They have got -> They’ve got
The boy has got -> The boy's got
I have not got -> I haven’t got
The girl has not got -> The girl hasn’t got
 

You are = you're
He is = he's
We are not = we aren't
She is not = she isn't
Stell is not = stell isn't

you're
he's
she's
we aren't
she isn't 
stell isn't