MY friend younger than Mary哪里错了

MY friend younger than Mary哪里错了 My friend heavier than Mary.哪里错了 She is very younger than Mary这句话哪里错了 My mother look younger than my aunt错在哪里? Mum,these are my friend,Jim and Mary哪里错了 Mary's two year younger than him.改错 My bag is lighter than h my younger brother younger than me. My mather___(look) younger than my aunt. my friend Mary Tom,()my friend,mary. My friend heavier than mine.中哪错了? Tom is young.John is younger than Tom.Mary is younger than J