IF
- a possibility [n IFS]
- a condition [n -S]
- in case that
- even though
- whether
- reservations, restrictions, or excuses
- en though although perhaps an interesting if untenable argument
- in the event that
- lowing that
- the assumption that
- condition that
- ether asked if the mail had come I doubt if I'll pass the course
- a function word to introduce an exclamation expressing a wish if it would only rain