When did Grey Worm ever "demonstrate an understanding of the Common Tongue"? When he heard Mero being insulting in "Second Sons"? That is confusing now that I think about it. Did book-Grey Worm ever understand Common Tongue? Or was it just sort of implied that Daenerys knew Low Valyrian well enough to converse with him in it? (aided by Missandei). --The Dragon Demands (talk) 00:15, November 14, 2013 (UTC)

Common Tongue

Grey Worm seems to acknowledge Daenerys's orders (given in Common Tongue) in the Season 4 premiere.

Yeah, I noticed. But he even did that in Season 3, reacting to the Second Sons, etc. I didn't want to keep pestering Peterson over this.

I think they...tacitly imply that everyone is actually speaking Valyrian in these scenes, when Grey Worm reacts to Common Tongue dialogue. The alternative is that he's picked it up, but I don't know.--The Dragon Demands (talk) 20:01, March 30, 2014 (UTC)

Okay, checking the book, Kraznys explains that as part of their robot-like training, Unsullied are expected to quickly pick up the language of whoever they sell them to (i.e. if you see Unsullied to Qohor, they are expected to quickly learn Qohorik Valyrian). Nonetheless, Kraznys says, she will need Missandei as an interpreter at first while they're still learning.
Even so...Daenerys later reveals that she actually knows High Valyrian, and she quickly learns Ghiscari Valyrian (she grew up in the Free Cities so she speaks Braavosi, Pentoshi, etc.). If you know French and Latin, you can pick up Spanish quickly. So the other possibility is that she never bothered to force them to learn Common Tongue of Westeros, given that Daenerys herself quickly learned their language of Ghiscari Valyrian.
Long story short, I was mildly worried about this in "Second Sons", though even then Daenerys had possessed her army for four episodes and some weeks of time pass. By this point we've at least got the word from the books that Unsullied are actually trained to pick up the new language of their owners as quickly as possible, to better serve them. -- but this is just for Common Tongue. Daenerys knows Free Cities Valyrian as her mother-tongue and rapidly learned how Ghiscari Valyrian varies from it. So in some scenes they might all be speaking in Valyrian, just translated into Common Tongue for the sake of the viewers.--The Dragon Demands (talk) 20:09, March 30, 2014 (UTC)