第一句（改为一般疑问句）：Do you want to be an english teacher?
(对i划线提问）：Who want to be an english teacher?
第二句（改成一般疑问句）：Will her sister arrive at your house before supper?
（改成否定句）her sister will not arrive at our house before supper.
（对before supper划线提问）When will her sister arrive at your house?