(How old)(are)(the twins')(mother).这句话中哪一个（ ）里错了,这是一题改错题

By the way how old are you How old are the twins改错 改错：How old are the twin's? i don't know how old you are其中how old you are是倒装吗? how old are you “How old are you? how old are you how old are How old are you? ( how old are How old are :How old are you? How old are you? How old are you in the photo?怎样回答 guess how old the woman().are,is,from填哪个 How old are the twin's?哪错了? How old is the man in the car?How high are the hills? how is the old