Minimal pairs · f · v
fan or van
F is a whisper; v is the same mouth with the voice switched on. Arabic has f but no v, so van turns into fan and very into fairy.
Hard for Arabic speakers
Press play, then tap the word you heard.
How to teach the mouth
One mouth, one switch: top teeth on the bottom lip for both. Put a hand on the throat — f is silent there, v buzzes like a bee. Start a long ffff, then switch the voice on mid-sound without moving: ffffvvvv.