1. The Common human language of the region is known as Shirish, named after the speakers of the language from the Shirelands.
2. Many individuals of the “civilized” non-human races (ie. dwarf, elf, halfing, gnome) are fluent enough in Shirish that they will speak it to humans that do not understand their own language. However, the more distant a human is from the Shirelands the likelier he is to encounter speakers of a foreign tongue.
3. Most “non-civilized” races (ie. orc, goblin, kobold) are not fluent in Shirish and will only speak in their native tongues.