His brother likes reading at home.
问题描述：
His brother likes reading at home.
What____his brother_____ ______at home.划线提问,该怎么填,为什么,
划线的是
reading
答
What（does）his brother(like)(doing)at home为什么？ like 第三人称不是要＋s的吗是的，在肯定句是这样，但是这里有助动词does，does已经是第三人称单数了啊，所以like用原型。