有没must to be done这种用法的?

有没must to be done这种用法的? to be done的用法 being done 和 be doing ;done ；doing ; be done ;to be done 的用法 be sorry to have done的用法 to be done 和having been done的用法 must have done的用法 need be done这种用法是错的吗? be to be done可以改成must be done to have done,to be done,to have been done,having done在用法上有什么 must be与belong to 的用法 有没有 look to be +adj这种用法的 must to be done与must be done是一样的吗?只是后者省略to而已,