Some of the alphabets are difficult for non-Keralites to pronounce.Their pronunciation is illustrated below. The tongue position is shown. Please listen to the sound from someone and try to make it as shown below. OR use the site 'Ente malayalam 'to listen to the sounds.
vala' = bangles,
na'alu = four, na'mmal = we
njaan = I, njangal = we
sa'ri = ok, right, correct
mazha = rain, ezhuthuka = to write