한국말 잘 못해요 (han-gug-mal-jal-mot-hae-yo)

I cannot speak Korean very well 

한국말 전혀 못해요 (han-gug-mal-jeon-hyeo-mot-hae-yo)

I cannot speak Korean at all

모르겠어요 (mo-reu-gess-eo-yo)

I don’t understand

미안하지만, 다시 한번 말씀해 주세요 (mi-an-ha-ji-man, da-si-han-beon-mal-sseum-hae-ju-se-yo)

I’m sorry but, could you please repeat that again?

천천히 말씀해 주세요 (cheon-cheon-hi-mal-sseum-hae-ju-se-yo)

Please speak slowly

영어를 하실 줄 아세요 (yeong-eo-reur-ha-sil-jul-a-se-yo)

Do you know how to speak English?