Here's why:
* Unique grammar: BSL has its own distinct grammatical rules, different from English. It uses spatial grammar, where the location of signs in space relates to the meaning of the sentence.
* Unique vocabulary: While some signs may be visually similar to English words, BSL has its own specific vocabulary that doesn't directly translate to English.
* Natural language: BSL is not just a series of gestures; it is a naturally occurring language developed and used by Deaf people in the UK.
* Official recognition: BSL is officially recognized as a language in the UK. It has been given legal recognition by the UK government, including provisions for BSL interpreters in certain contexts.
However, BSL is not simply a visual version of English. It has its own unique structure, grammar, and cultural context.