The “th” sound is a voiceless dental fricative, as in the words “thin” and “think.” It is produced by placing the tip of the tongue between the upper and lower front teeth and blowing air through the gap.

The “f” sound is a voiceless labiodental fricative, as in the words “fun” and “fish.” It is produced by placing the upper teeth on the lower lip and blowing air through the gap.

The “v” sound is a voiced labiodental fricative, as in the words “van” and “very.” It is produced by placing the upper teeth on the lower lip and vibrating the vocal cords while blowing air through the gap.