when you think you had enough tea put the tea spoon on top of tea glass that means [ you have had enough tea and you dont want any more ], this is the polite way to say "NO"..

When they say " Hoşgeldin [welcome] " to you, reply them by saying " Hoşbulduk "

Say " Çok yaşa " to the one who has just sneezed.

Say " Geçmiş olsun ´ to someone who is ill or had an accident.

Say " Elinize sağlık " [health to your hand] to your host to compliment them on their cooking at the end of the meal.