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IMPORTANT REGIONAL DIFFERENCES
In spoken American English, the use of the Simple Past and Present Perfect are often used contrary to the rules of grammar, particularly where the words 'yet' and 'yesterday' are concerned.
In South West England, the following regional errors can be heard: I be, he be, we be, they be, etc.
In Yorkshire, the definite article is often omitted in speech.
This article is taken from : http://www.musicalenglishlessons.com/tips-speaking.htm
(English used to have the singular form 'thou', which was often used in the intimate way like 'tu' or 'du'. In fact, in dialects in parts of England, this is still sometimes used. And in the Republic of Ireland, they have a very sensible plural form of 'you', when speaking to several people: 'yous'.)
The difficult parts of English are: