He often goes to the museum with his friend on Sunday.（划线提问,第一个he,第二个to the museum第三个his friend,第四个on Sunday.)
1.Who often goes to the museum with his friend on Sunday?
2.Wher does he often go with his friend on Sunday?
3.Who does he often go to the museum with on Sunday?
4.When does he often go to the museum with his friend