@atharshah
jinns have very long ages , plenty of time for them to learn any language ( if they cant already ) .
some incidents even indicate the presence of SAHABI jinns till this date.
for the second part , we at our most basic form are electrons and protons . ---- ENERGY .
and a jinn can appear and dissappear , just like Iblees appared to ibrahim ( a.s) and then dissappeared .
they are made from smokeless fire . remember that . this is a property of fire .
if you want proof then try lighting a cigarette , with a flameless lighter (heater lighter as called) . from a distance where the flame isnt even reaching .
Notice a flame , the top part , its not visible to you , but yet it can light up a cigarette .
In desi language , Aag ki LAU. (Pronounced law)
This is what they are made of .
And as a property of fire , down the flame , the fire becomes visible to our eyes .
So the same flame of fire is invisible to us at the top part ,and visible in the middle .
This answers your query sufficiently . I suppose .
