 Hong Kong Sign Language derives from the southern dialect, but by now is a separate language.The Shanghai dialect is found in Malaysia and Taiwan, but Chinese Sign Language is unrelated to Taiwanese Sign Language (which is part of the Japanese family), Malaysian Sign Language (of the French family), or to Tibetan Sign Language (isolate).CSL shares morphology for forming negative clauses with British Sign Language; it may be that this is due to historical contact with the British in Shanghai.