Alveolars: are sounds formed with the front part of the tongue on the alveolar ridge, which is the rough, bony ridge immediately behind and above the upper teeth. The tongue tip and/or blade articulates against the teeth ridge. [t] and [s] are voiceless whereas[mark=#FFFF00] [d], [z] and [n] are voiced.[/mark] Other alveolars are [l] and [r].