He wants to be an engineer when he grows up.改为一般疑问句
问题描述：
He wants to be an engineer when he grows up.改为一般疑问句
His mother is a worker.对画线部分提问
_________
They're English books.改为单数形式
答
does he want to be an engineer when he grows up?
what does his mother do?
it is an english book