be sure to do和be possible to do和due bound有何区别

问题描述:

be sure to do和be possible to do和due bound有何区别

be sure to 确保(自己)会做某事
be possible to do (自己)可能会做某事
be due to 强调事情已经安排好,按计划做某事
be bound to强调事情只是猜测而已