1. Introduces a conditional clause
   "I will go to university if I can afford it" 
2. Despite being
   "he's nice, if rather patronizing" 
3. Every time that
   "if I call you are always engaged"
   - whenever, when

Encyclopedia: If

• perfective
• perfective aspect
• perfective tense
• perfectly
• perfectness
• perfervid
• perfidious
• perfidiously
• perfidiousness
• perfidy
• perfluorocarbon
• perfoliate
• perfoliate leaf
• perforate
• perforated
• perforated eardrum
• perforating vein
• perforation
• perforator
• perforce
• perform
• performable
• performance
• performance art
• performance bond