to find out (something)(in order to be certain)

make sure

to make sure (that) something will happen

guarantee; make secure

(to cause a person, animal) to be, rest, in a comfortable or new position; to become established in a new place, job, way of life; to make an agreement about (a dispute); to pay (a debt)

straighten out, resolve

to test the truth or accuracy of (a report etc); (of an event etc) to prove, show, the truth of (something)

confirm, validate

pledge, promise

pledge, promise