(introducing a conditional clause) on the condition or supposition that; in the event that

if you have a complaint, write to the director

if you like I'll put in a word for you

despite the possibility that; no matter whether

if it takes me seven years, I shall do it

(often used in indirect questions) whether

he asked if we would like some coffee

I wonder if she noticed

expressing a polite request

if I could just use the phone, I'll get a taxi

if you wouldn't mind giving him a message?

expressing an opinion

that's a jolly long walk, if you don't mind my saying so

if you ask me, he's in love

expressing surprise or regret

well, if it isn't Frank!

(with implied reservation) and perhaps not

the new leaders have little if any control

a condition or supposition

there are so many ifs and buts in the policy

on one occasion or for one time only

they deliver once a week

at some time in the past; formerly

Gran had once been a famous singer

multiplied by one

once two is two

intermediate frequency