"english must be altered to suit different purpose and different audience".yes or no? justify with relevant examples and explanation. must be attered to suit different purposes and different audiences

Yes, because different audiences require different styles of presentation.

An academic approach to teaching a Mathematics problem can be a bore to high school students. On the other hand, it can elicit a different reaction with those who like the subject. This kind of situation can be compared to a game where strategy and approach of a speaker are carefully studied besides mastery of the subject matter.   

Association of the audience is also a big factor in maneuvering the discussion and delivering it properly.  If the speaker failed to build the connection, the communication between them would fail.  There could be a hard time for audiences to digest and comprehend everything. So it's important to do a background check on the profiles of the audiences.