Definatley!

My younger brother didn't take any lessons he just hung with his Thai mates everyday. My brother is fully English but we all call him a Thai kid because he eats like a Thai, speaks Thai and looks Thai. On Christmas day he wanted to sit on the floor outside and eat spicy fish instead of being with us eating farang food!

So he speaks amazing Thai. I would rather have a teacher explaining to me rather than learning the way my brother did, he speaks mostly slang too.

But lessons have certainly helped me.