用be doing when do造5句,是陈述句,

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用be doing when do造5句,是陈述句,

用be doing when do造5句,是陈述句,急!
1.I am doing my homework when he watches TV.
2.When you go to school your sister is crying.
3.When I come home my mother is cooking.
4.He is singing when you ask the teacher questions.
5.My friend is sweeping the floor when his mother gets home.