Alan can not go to school because he hurt his knee对划线部分提问（because he hurt his knee)

Alan can not go to school because he hurt his knee对划线部分提问（because he hurt his knee)
Alan can not go to school because he hurt his knee对划线部分提问（because he hurt his knee)

Alan can not go to school because he hurt his knee对划线部分提问（because he hurt his knee)
Why can't Alan go t school

后面是原因 所以用why提问
Why can't Alan go to school ?