Pronounciation Difference: ㅅ & ㅆ

[frequentflyer120]

Can any native speakers help me with understanding the difference between 시옷 and 쌍시옷?
I am able to hear the difference and pronounce the other tensed and aspirated letters (ㅂ,ㅃ,ㄷ,ㄸ,ㄱ,ㄲ, and so on...) but I can't make my tongue imitate the correct sounds for ㅅand ㅆ. Any suggestions?

고맙습니다!

-FF120 (Frequentflyer120)

[polishboy]

sometimes it is like st.
있어요.
I heard it as istoyo.
I think you can try to listen to on online courses with aidio files.
www.teenkoren.net.
or site or sogang university for laenring Korean (these sites are my favourite fro learnign Korean).