Top teeth on your bottom lip, exactly like /f/. Turn your voice ON — vvvvv. Your lip will tickle.
Check yourself: Hand on your throat: /v/ buzzes, /f/ does not. Feel the tickle on your lip.
Watch for: /f/ and /b/. This sound does not exist in Somali or Arabic, so expect it to need real teaching, not a reminder.
◆ marks a word that does NOT follow today's pattern — Blumenfeld boxes these on the page. Teach it by heart; do not let the class sound it out and lose faith in the rule.
Say the word, have them repeat it, count the sounds on fingers, THEN write. The count is what stops a child writing the first letter and guessing the rest.