Hello The answer above is really good. However, from my experience, Korean people are more likely to say 'When are you coming to MY COUNTRY'? They less prefer to say the name of the country as it seems that they like the word 'my'. However, this is only the case when you know where the person comes from but I think that's pretty straightforward. 우리 나라 언제 와요 = polite 우리 나라 언제 와= casual, you use it when you are similar age or is a friend with the person you are talking to 우리=my/our 나라= country 언제= when 와= come Hope this helps^^

Hmm Let me give it a shot >___< 언제 미국에 와요? eon-je mi-gug-e wa-yo 미국 - America 언제 - when 와요 - come replace mi-gug(미국) with the country you want to say. If Japan that would be il-bon ("일본"). The 'e' (에) is a location marking particle. Hope that helps! Also, experts please feel free to correct me :) Cheers!