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Multicultural London English
Sociolect of English in the United Kingdom
Multicultural London English (abbreviated MLE) is a sociolect of English that emerged in the late twentieth century. It is spoken authentically by the low classes, mainly young people in London (although there is evidence to suggest that certain features are spreading further afield). According to research conducted at Lancaster University and Queen Mary University of London, "In much of the East End of London the Cockney dialect... will have disappeared within another generation.... it will be gone [from the East End] within 30 years.... It has been 'transplanted' to... [Essex and Hertfordshire New] towns."
As the label suggests, speakers of MLE come from a wide variety of ethnic and cultural backgrounds, and live in diverse inner-city neighbourhoods such as Brent, Lambeth and Hackney. As a result, it can be regarded as a multiethnolect. One study was unable "to isolate distinct (discrete) ethnic styles" in their data on phonetics and quotatives in Hackney and commented that the "differences between ethnicities, where they exist, are quantitative in nature". In fact, they find that it is diversity of friendship groups that is most important; the more ethnically diverse an adolescent's friendship networks are, the more likely it is that they will speak MLE.
In the press, MLE is sometimes referred to as "Jafaican", conveying the idea of "fake Jamaican", because of popular belief that it stems from immigrants of Jamaican and Caribbean descent. However, research suggests that the roots of MLE are much more complex. Two Economic and Social Research Council funded research projects found that MLE has most likely developed as a result of language contact and group second language acquisition. Specifically, it can contain elements from "learners' varieties of English, Englishes from the Indian subcontinent and Africa, Caribbean creoles and Englishes along with their indigenised London versions (Sebba 1993), local London and south-eastern vernacular varieties of English, local and international youth slang, as well as more levelled and standard-like varieties from various sources." 
Was/were variation: The past tense of the verb "to be" is regularised. Regularisation of was/were is something that is found across the English speaking world. Many non-standard systems in Britain (and parts of the US Mid-Atlantic coast) use was variably for positive conjugations, and weren't for negative conjugations (System 1 below) to make the distinction between positive and negative contexts clearer (cf. will/won't and are/ain't). Most non-Standard varieties in the English speaking world have a system where both positive and negative contexts have levelled to was (System 2 below). Speakers of MLE use any of the three systems, with choice correlating with ethnicity and gender. Cheshire and Fox (2008) found the use of non-standard was to be most common among Black Caribbean speakers, and least common among those of Bangladeshi descent. Bangladeshis were also found to use non-standard weren't the least, but this variable was used more by White British speakers than anyone else.
Non-standard system 1
Non-standard system 2
I was, I wasn't
I was, I weren't
I was, I wasn't
You were, you weren't
You was, you weren't
You was, you wasn't
He/she/it was, he/she/it wasn't
He/she/it was, he/she/it weren't
He/she/it was, he/she/it wasn't
We were, we weren't
We was, we weren't
We was, we wasn't
An innovative feature is the ability to form questions in "Why ... for?" compared to Standard English "Why ...?" or "What ... for?".
The "traditional Southern" England phrasal preposition "off of" has "robust use", especially with "Anglo females".
Man as a pronoun: 'Man' is sometimes used as a first person singular pronoun, which may be rendered "man's" when combined with certain verbs such as "to be" and "to have": "man's got arrested", "man's getting emotional". "Man" can also be used to refer to the second-person or third-person singular: "Where's man going?" (Where are you/is he going?)
Innit, a reduction of 'isn't it', has a third discourse function in MLE, in addition to the widespread usage as a tag-question or a follow-up as in  and  below. In MLE, innit can also mark information structure overtly, to mark a topic or to foreground new information, as in .
 they was getting jealous though innit
 Hadiya: it weren't like it was an accident
 yeah I know. I'm a lot smaller than all of them man and who were like "whoa". I mean the sister 'ight she's about five times bigger than you innit Mark?
While older speakers in London display a vowel and consonant system that matches earlier descriptions, young speakers often display different qualities. The qualities are on the whole not the levelled ones noted in recent studies (such as Williams & Kerswill 1999 and Przedlacka 2002) of teenage speakers in South East England outside London: Milton Keynes, Reading, Luton, Essex, Slough and Ashford. From principles of levelling, it would be expected that younger speakers would show precisely the levelled qualities, with further developments reflecting the innovatory status of London as well as the passage of time. However, evidence, such as Cheshire et al. (2011) and Cheshire et al. (2013), contradicts that expectation.
Fronting of /ʊ/, the vowel in FOOT: "more retracted in the outer-city borough of Havering than in Hackney"
Lack of /oʊ/-fronting: fronting of the offset of /oʊ/ "absent in most inner-London speakers" of both sexes and all ethnicities but "present in outer-city girls".
/aɪ/-lowering across region: it is seen as a reversal of the diphthong shift. However, the added fronting is greater in London than in the southeastern periphery, resulting in variants such as [aɪ]. Fronting and monophthongisation of /aɪ/ are correlated with ethnicity and strongest among non-whites. It seems to be a geographically directional and diachronically gradual process. The change (from approximately [ɔɪ]) involves lowering of the onset, and as such, it is a reversal of the diphthong shift. It can be interpreted as a London innovation with diffusion to the periphery.
Raised onset of the vowel in words like FACE, which results in variants such as [eɪ]. Like /aɪ/, monophthongisation of /eɪ/ is strongest among non-whites. It is also seen as a reversal of the diphthong shift.
/aʊ/ realised as [aː] and not "levelled" [aʊ]: In inner-city London, [aː] is the norm for /aʊ/. Additionally, [ɑʊ] is used by some non-whites, especially girls, in the inner city.
Backing of /æ/ can result in variants such as [a̠].
Backing of /ʌ/ results in variants such as [ɑ] or [ʌ], rather than [ɐ].
Reversal of H-dropping: word-initial /h/ was commonly dropped in traditional Cockney in words like hair and hand. That is now much less common, with some MLE speakers not dropping /h/ at all.
Backing of /k/ to [q]: /k/ is pronounced further back in the vocal tract and is realised as [q] when it occurs before non-high back vowels, such as in words like cousin and come.
Th-fronting: /θ/ is fronted to [f] in words such as three and through (which become free and frough), and /ð/ is fronted to [v] words such as brother and another, which become bruvver and anuvver.
Th-stopping: interdental fricatives can be stopped, and thing and that become ting and dat.
According to Geoff Lindsey, one of the most striking features of MLE is the advanced articulation of the sibilants /s, z/ as post-dental [s̪, z̪].
Like many in most of the rest of England, Multicultural London English is non-rhotic.
^ abcdefghCheshire, Jenny; Kerswill, Paul; Fox, Sue; Torgersen, Eivind (1 April 2011). "Contact, the feature pool and the speech community: The emergence of Multicultural London English". Journal of Sociolinguistics. 15 (2): 151–196. doi:10.1111/j.1467-9841.2011.00478.x. ISSN1467-9841.
^Wolfram, Walt; Schilling-Estes, Natalie (1994). "Convergent explanation and alternative regularization patterns: Were/weren't levelling in a vernacular English variety". Language Variation and Change. 6 (3): 273–302. doi:10.1017/S0954394500001691.
Cheshire, Jenny, Nortier, Jacomine and Adger, David (2015), Emerging multiethnolects in Europe(PDF), Queen Mary's Occasional Papers Advancing Linguistics, 33, archived from the original(PDF) on 4 March 2016, retrieved 17 January 2016CS1 maint: Multiple names: authors list (link)