改被动句my sister helped me to carry one of my old bookcases up
改被动句my sister helped me to carry one of my old bookcases up the stairs.
i was helped by my sister to carry one of my old bookcases up the stairs.
i was helped that my sister carry one of my old bookcases up the stairs.
这两句对吗,这句还可不可以改成其它的被动句啊