1. Conditional (unlikely) situation, should: 'If I were you,
I'd apologize'. 2. Granting that, accepting that: 'If she blabs,
we're all in deep trouble'. 3. On the condition that: 'I will
go only if you go'. 4. Even though, though: 'an attractive if
naive girl'. 5. In exclamations, it indicates a better circumstance:
'If only I had never met Phil Anders!' 6. Whether, introducing
a subordinate question: 'Ask if she does windows'.
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