Помогите пожалуйста а!!!

Helen's young sister
The boys' coats
My father's key
Jane's textbook
An Englishman's house
My parent's room
My younger sister's toys
The pupil's answers.
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Who is over day? I can't see till there.
What language is he speaking? I can't understand.
Tom's too tired. He can't walk.
No, Anna is not going to the skating-rink. She doesn't know how to skate.
Speak louder please. I can't hear.