be bound to do

一定，必定

be all ears, be ashamed of, be ashamed to do, be assigned to do, be associated with, be astonished at, be at ease with, be at the end, be at war, be attached to, be attentive to, be available for, be available to, be aware of, be beneficial to, be better off, be blessed with, be blind to, be bound for, be bound to, be bound up in, be bound up with, be burned to a crisp, be busy doing, be busy with, be capable of, be careful of, be careful with, be caught up in, be cautious of, be centered on, be central to, be certain of, be certain to do sth, be characteristic of, be charitable to, be civil to, be clear about, be close to, be committed to doing sth.,