If you speak Castillian Spanish (as in Madrid), the "th" sound in English is very much like the "c" in Spanish in words like graCias, fasCinante, etc.
١ أغسطس ٢٠١٤
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There are MANY videos online about how to pronounce TH. :) Here's one:
https://www.youtube.com/watch?v=VUAYmTnWaCY
When you practice in the mirror, make sure you can see your tongue as you pronounce the sound. If it's behind your teeth, then you're doing it wrong.