In linguistic terms, sign languages are as rich and complex as any spoken language, despite the common misconception that they are not "real languages". Professional have studied many sign languages and found that they exhibit the fundamental properties that exist in all languages.
Sign languages generally do not have any linguistic relation to the spoken languages of the lands in which they arise. The correlation between sign and spoken languages is complex and varies depending on the country more than the spoken language. For example, the US, Canada, UK, Australia and New Zealand all have English as their dominant language, but (ASL), used in the US and most parts of Canada, is derived from whereas the other three countries sign dialects of . Similarly, the sign languages of Spain and Mexico are very different, despite Spanish being the national language in each country, and the sign language used in Bolivia is based on ASL rather than any sign language that is used in a Spanish-speaking country. Variations also arise within a 'national' sign language which don't necessarily correspond to dialect differences in the national spoken language; rather, they can usually be correlated to the geographic location of residential schools for the deaf.
Sign the phrase 'How Are You?' using these American Sign Language symbols. Communicate in sign language with the basic conversational phrases in this free video on the American Sign Language from a signing expert.