if

if conjunction uk/ɪf/ us if conjunction
(MIGHT)

B1 used to talk about something that might happen or be true

если
I'm sorry if I've offended you. What will we do if this doesn't work? if conjunction
(ALWAYS)

B1 used to mean always or every time

каждый раз когда
If you mention his mother, he always cries.

IF noun

[ C ]
 informal uk/ɪf/ us
something that is not certain or not yet decided

неопределенность, сомнение
There are still a lot of if s. There are no if s and buts (= no doubts or excuses) about it - we'll have to start again.