7 Filt in with who or whose Then, choose the correct item. Write in your notebook. is this ball? It's Tony's/Tonys'. 2 ... is she? She's the girls/girls' mum. is Mr Jones? He's the boys/boys' Maths teacher 4 ... is this pen? It's Mary's/Marys' is the girl over there? She's my brother's/brothers' Steve best friend