问题描述：
英语厉害的就速速戳进来了!一般疑问句,反问句,提问
1 David is my classmate.改成一般疑问句,反问句,并对David提问.
2 He is twelve years old.改成一般疑问句,反问句,并对twelve提问.
3 We often help each other.改成一般疑问句,反问句,并对We提问.
1 David is my classmate.改成一般疑问句,反问句,并对David提问.
2 He is twelve years old.改成一般疑问句,反问句,并对twelve提问.
3 We often help each other.改成一般疑问句,反问句,并对We提问.
问题解答：
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