We often use (be) due to/ set to/ about to/ on the verge of or am/ is/ are to to talk about something that is ready to happen in the near future.
eg. He’s on the verge of quitting his job.
A new airport tax is due to be introduced.
We use (be) likely to/ unlikely to/ sure to/ certain to/ bound to to say how certain we are that something will happen.
eg. She’s bound to want to travel after she graduates.
NB: We use a verb + ing or a noun after “on the verge of”
and an infinitive after (be) due to/ set to/ about to/ likely to/ sure to/ unlikely to/ certain to/ bound to/ is to