1 Danny didn't break his leg last month
2 where did they go last week?
3 My mother showed some picture to me
4 He walked to school yesterday morning. ( 这句本般就是一般过去时，只不过动词时态你用错，walk要用过去式，即WALKED）
如果是改为一般疑问句就是：
Did he walk to school yesterday morning?(一般疑问句）
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