different meaning. Facial expression falls under the nonmanual feature component of phonology. These include "eyebrow height, eye gaze, mouthing, head movement, and torso rotation." Grammar In common with other languages, whether spoken or signed, BSL has its own grammar which govern how phrases are signed. BSL has a particular syntax. One important component of BSL is its use of proforms. A proform is "...any form that stands in the place of, or does the job of, some other form." Sentences are composed of two parts, in order: the subject and the predicate. The subject is the topic of the sentence, while the predicate is the commentary about the subject. BSL uses a topic–comment structure. Topic-comment means that the topic of the signed conversation is first established, followed by an elaboration of the topic, being the 'comment' component. The canonical word order outside of the topic–comment structure is object–subject–verb (OSV), and noun phrases are head-initial. Relationships with other sign languages Although the United Kingdom and the United States share English as the predominant oral language, British Sign Language is quite distinct from American Sign Language (ASL) - having only 31% signs identical, or 44% cognate. BSL is also distinct from Irish Sign Language (ISL) (ISG in the ISO system) which is more closely related to French Sign Language (LSF) and ASL. It is also distinct from Signed English, a manually coded method expressed to represent the English language. The sign languages used in Australia and New Zealand, Auslan and New Zealand Sign Language respectively, evolved largely from 19th century BSL, and all retain the same manual alphabet and grammar and possess similar lexicons. These three languages may technically be considered dialects of a single language (BANZSL) due to their use of the same grammar and manual alphabet and the high degree of lexical sharing (overlap of signs). The term BANZSL was coined by Trevor Johnston and Adam Schembri. In Australia deaf schools were established by educated deaf people from London, Edinburgh and Dublin. This introduced the London and Edinburgh dialects of BSL to Melbourne and Sydney respectively and Irish Sign Language to Sydney in Roman Catholic schools for the deaf. The language contact post secondary education between Australian ISL users and 'Australian BSL' users accounts for some of the dialectal differences we see between modern BSL and Auslan. Tertiary education in the US for some deaf Australian adults also accounts for