Actually, there are many versions of English.  
For a start, there are regional dialects, for example, US English, British English, Australian English, Indian English. These differ in vocabulary, pronunciation, spelling, and quite often more sbtly in common expressions and idioms. And within these regional dialects there are further regional variations, much less pronounced here in Australia than in some other regions such as the US or UK. 
But as well as these variations, there are, within each dialect, a wide range of specialised variants, which are linked to specific groups within society, often occupations or sports etc, and often crossing between dialects. 
And then for all these variants of English, there are variants in the way each dialect is used, according to the situation. For example, spoken English, written English, Telegraphese, Textspeak, etc, and even within these there are variations according to circumstances.
As an example, in spoken Australian English, the words and structure used would be quite different between supporting your team from the sidelines, giving the eulogy at a funeral, or giving evidence in court. Similarly, written English will be very different if writing a letter to a friend, writing a job application, or writing a scientific paper.
In some of these situations adherence to accepted rules of standard English (for the dialect you are using) are important (e.g. the scientific paper, a job application) and for others much less so, although for most people it is good practice to endeavour to always adhere to the rules, so that it is easy to ensure that you do in those cases where it really does matter!
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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