[the] hospital, though he eats not. Certain words in Afrikaans arise due to grammar. For example, , which literally means "must not", usually becomes ; although one does not have to write or say it like this, virtually all Afrikaans speakers will change the two words to in the same way as do not shifts to don't in English. The Dutch word ("it" in English) does not correspond to in Afrikaans. The Dutch words corresponding to Afrikaans are , , and . Phonology Vowels As phonemes, and occur only in the words 'mirror' and 'bullet', which used to be pronounced with sequences and , respectively. In other cases, and occur as allophones of, respectively, and before . is phonetically long before . is always stressed and occurs only in the word 'wedges'. The closest unrounded counterparts of are central , rather than front . occur only in a few words. occurs as an allophone of before , though this occurs primarily dialectally, most commonly in the former Transvaal and Free State provinces. Diphthongs occur mainly in loanwords. Consonants All obstruents at the ends of words are devoiced, so that e.g. a final is realized as . occur only in loanwords. is also an allophone of in some environments. is most often uvular . Velar occurs only in some speakers. is usually an alveolar trill or tap . In some parts of the former Cape Province, it is realized uvularly, either as a trill or a fricative . Dialects Following early dialectal studies of Afrikaans, it was theorised that three main historical dialects probably existed after the Great Trek in the 1830s. These dialects are the Northern Cape, Western Cape, and Eastern Cape dialects. Northern Cape dialect may have resulted from contact between Dutch settlers and the Khoi-Khoi people between the Great Karoo and the Kunene, and Eastern Cape dialect between the Dutch and the Xhosa. Remnants of these dialects still remain in present-day Afrikaans, although the standardising effect of Standard Afrikaans has contributed to a great levelling of differences in modern times. There is also a prison cant, known as Sabela, which is based on Afrikaans, yet heavily influenced by Zulu. This language is used as a secret language in prison and is taught to initiates. The term Kaapse Afrikaans ("Cape Afrikaans") is sometimes erroneously used to refer to the entire Western Cape dialect; it is more commonly used for