1.Is Mrs Chang painting in the office.
Yes,she is ./ No,she isn't
2.不知道对哪个单词划线提问
如果对 students 划线提问:Who cleaned the classroom this morning?
如果对 cleaned 划线提问:What did the students do this morning?
如果对 classroom 划线提问:Where did the students clean this morning
如果对 this morning 划线提问:When did the students clean the classroom