Помогите, опять брат замучился(

Question

Помогите, опять брат замучился(

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Answer 1

2. these are tony & bil's pencils
    they are their pencils
    these pencils are their 
3. this is mom's apron
    it's her apron
    this apron is her
4. this is house's roof
    it's roof is house's