a certain Mrs. Jones.
a certain popular teacher.
a quick and certain remedy.
a sure way to distinguish the two.
be certain to disconnect the iron when you are through.
be sure to lock the doors.
certain breeds do not make good pets.
certain members have not paid their dues.
felt certain of success.
he faced certain death.
he is sure to win.
he was certain to fail.
his fate is certain.
his fate is certain.
his fate is sealed.
In this life nothing is certain but death and taxes.
it is certain that they were on the bus.
set aside a certain sum each week.
sudden but sure regret.
sure of her friends.
the date for the invasion is certain.
to a certain degree.
was sure (or certain) she had seen it.
was very sure in his beliefs.
what is certain is that every effect must have a cause.
wood dust is a sure sign of termites.