He is reading a book.(对划线部分提问）reading a book划得线.

He is reading a book.(对划线部分提问）reading a book划得线. Mark is reading a book in his bedroom.(对划线部分提问) （reading a b My sister is reading a book.就划线部分提问reading a book是画线部分 The boy is reading a book.(划线部分提问) she is reading a book对reading a book提问 He's reading a book under a tree.对划线部分提问 I'm reading a book.划线提问,如果划了reading a book,应该怎么问? I am reading a book at home对划线部分提问 划线部分是reading a book He is reading a story book( under a big tree)对括号内的部分提问 He is reading a book. He is reading a book （ ）English. l'm reading a book 对 reading a book 部分进行提问