1.( Which ) girl ( is drawing ) a picture?
2.He ( isn't ) ( reading ) a book.why?1. The gir in red is drawing a picture. 穿红色衣服的那个女孩在画画对 red 提问用which2. 现在进行时的否定结构是： 主语 + am/is/ are + not + 现在分词 （ is not 缩写成 isn't )