If is a word to describe a statement where one thing depends on something else.

For example:

• We can call this true if there is proof.
• We will play outside if it does not rain.

If — is a poem written by Rudyard Kipling. It appeared in the Brother Square Toes chapter of Kipling's book Rewards and Fairies. In a 1995 BBC opinion poll, it was voted Britain's favourite poem. It is arguably Kipling's most famous poem.

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