if

From Wiktionary
if is on the Basic English 850 List.
idea - if - ill
if is one of the 1000 most common headwords.
identify - if - imagine

Pronunciation[change]

Preposition[change]

Preposition
if

  1. If is used in a condition:
    1. When something will cause something else
      If it rains, I will get wet.
    2. When a condition is not true
      I'd prefer it if you took your shoes off.
    3. although
      He was a great friend, if a little strange.
    4. When ... occurs (a programming statement).
      If A, then B, else C.

Subordinator[change]

Subordinator
if

  1. If is used to report questions and things that are unknown.
    She asked if they had arrived yet.
    I don't know if I want to go or not.

Noun[change]

Singular
if

Plural
ifs

  1. If is a conditional situation.
    There are many ifs we need to consider before we start on the plan.