Games that help with learning English

gta san andreas! :D

GTA IV -----> Translate every sentence of Little Jacob ----> My job is done here.

mmo game > all

Morrowind and Star Wars Games singlehandedly taught me english.

But any social(online) game will probably work wonders as well.

Ace Attorney series.

yeah.. your friend...sure...

Good wordy games would be the best, RPGs. Try some Elder Scrolls games, Morrowind or Oblivion would be the best for learning English (remember to read the books in-game), or some of the more old school BioWare games like Dragon Age: Origins or Knights of the Old Republic.

My teacher usually gave us game to play and would give exercises based on the game dialogue / story / etc, so having some kind of writing task would greatly improve her changes of learning something.

RPGs in general would be a good guess. Old ones like Baldur´s gate / Neverwinter, where dialogue is writen and there is plenty of time to read usually are better tools for learning.

How does someone not know English at any level? I would recommend RPGs, from Mass Effect, Elder Scrolls to Dragon Age but that would be "difficult dialogue" but other games won't teach you much.

I learned watching Cartoon Network as a kid, associating actions to words and hearing how they were pronounced. It helped that there weren't many episodes and you literally learned by repetition.

Internet forums are another good option, she might want to join some forum and practice writing.

World of Warcraft, Guild Wars 2, LoL, Dota2. Games that can require teamplay usually helps

There is a good game called "Real Life". Awesome graphics, but shitty gameplay.

I myself improved my English playing old LucasArts adventure games (though their humor suffers if you aren't good enough yet), as well as Final Fantasy and Chrono Trigger. Like others said, wordy games should be good.

For something more specific, I'd recommend Indiana Jones and the Fate of Atlantis. It's like an Indy movie that was never made.

Most RPGs or adventures would qualify, just be careful. In MMOs, I wouldn't recommend learning from other players' chat (unless you can safely recognize mistakes). In games like GTA or Planescape: Torment, be careful with slang expressions. In recent games (say, Oblivion and newer), you often have the additional benefit of voice acting, which also helps a lot.

(Also, if she's not a gamer, an RPG might be too much to start with, so an adventure might be easier to get into.)

There used to be this game called a dictionary

MMORPGs are best in my opinion. They help you with the conversation part and with the vocabulary. You must have a little knowledge of the language anyway.

Zork series are awesome. They are just text based and can be found anywhere on the web. It has simple english and you have to communicate with the pc using basic sentences like "go north", or "break door", and stuff. And as you read the texts as you progress, you really improve the number of words you know.

P.S. There is also a Sherlock Holmes version of such a game made by the same company. You just need DosBox to run the game ;)

Edit: The link to the game here. It's not pirated version. It's directly from the producer's website.
Link: http://www.infocom-if.org/downloads/downloads.html

I'd suggest playing RPGs, visual novels or other heavily story-based games.

Old school RPG games with a dictionary in one hand.

football manager monkey island aaaand fortix

Classic adventure games are good, since they're usually played at your own pace and much of the dialog can be, and will be, repeated. I'm assuming the game has subtitles and voice and you're willing to look things up as you play.
They're particularly nice because everything you usually do in a classic adventure game is based around specific verbs, and being able to verb thing with lots of different things, you get a good sense of how the language works and how it can vary, depending on the subject.

On the down-side, it's much slower to play through in a foreign language, the cut-scenes go by too fast to get everything out of them, so you might miss out on the finer details of the story, and if it has bad (illogical) puzzles, not understanding the language is going to make it worse. Also, if it's a humorous adventure game, many of the jokes will unfortunately go unnoticed (the ones that don't though, make it that much more awesome of a learning experience -- I GOT that JOKE! Hell yeah! :D).

(I've been playing a classic adventure called "Hollywood Monsters" that's (without a recent 3rd-party mod) only been available in Spanish. I've definitely needed a walkthrough for some parts, but I attribute a lot of that to either poor game design choices or strange puzzles, rather than language issues.)

Super Mario RPG?

I can only second KOTOR and its sequel, but if there's something that should really boost his knowledge, it's a multiplayer game with lots of chatting around. For me the perfect example was Jedi Knight 3: Jedi Academy. The game is awesome in multi, and the community I found was awesome (now I'm part of it too, thankfully). Usually you find lots of players just standing around or jumping around and chatting, and I admit, even I connected a few times to our server only ot have some fun - by chatting.

But hey, any multiplayer with lots of chat should do good. It takes roughly around half a year to reach a nice level of understanding/ability to communicate.

Quests. any

Heroes series?