be due to强调预先安排好了,有按计划进行的意思。如:the class is due to begin at 8:00.
be bound to 强调猜测,如:He is bound to be late for work if he still wants to pay Jean a visit first.
be bound to do意思为一定会怎样。
e.g. She is bound to come. 她一定会来的。
be due to是表示由于
e.g. her absence is due to illness. 她因为生病所以缺席了。
be bound to do sth. 必定。。。
be due to do sth 预计会。。。
be due to (介词)sth 是由于。。。