Korean · Pronunciation Guide
gam-sa-ham-ni-da. Note that the third block is written 합 with a ㅂ but comes out as 'ham', because ㅂ turns into ㅁ in front of the ㄴ that follows.
gamsahamnida
Five syllables delivered flat and quick -- this is a set phrase, so it behaves almost as a single word. The event worth marking is not stress but the ㅂ-to-ㅁ nasalization at the 합+니 boundary, which is exactly why the romanization writes 'hamnida' and never 'hapnida'.
Listen: 감사합니다
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도와주셔서 감사합니다.
Dowajusyeoseo gamsahamnida.
Thank you for your help.
Listen: 도와주셔서 감사합니다.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
도와주셔서 감사합니다 stacks a reason clause in front, and 주셔서 hands you three y-glide vowels in a row -- ju-syeo-seo -- which must not collapse into 'joo-suh-suh'. Keep the ㅅ+ㅕ combination genuinely sh-flavoured before the phrase settles onto 감사합니다.
Nearly every beginner says 'gam-sa-hap-ni-da', reading the ㅂ literally off the page. Korean does not permit a stop directly before a nasal there; the ㅂ becomes ㅁ, without exception. The other habitual error is a full English G at the front, when ㄱ here is unaspirated and only lightly voiced, closer to a very gentle k than to the g of 'gum'.