be kept to do

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be kept to do
keep是使役动词,使役动词在被动语态中不是要还原to吗,keep怎么还原?请举一例

she was kept to do homework by her mother.her mother kept her do homework.

be kept to do 为什么是must be kept而不是must to be kept Our room must ___ clean.A.keep B.be kept C.to be D.kept People should ____cutting trees A be kept to cut B be kept f be supposed to be\do be paid to do be dying to do be eager to do be anxious to do be strength to do be about to do be intended to do