Student or Learner
What does 'yet' mean when it stands in the beginning of the sentence like that: 'Yet, although people were expected to learn English, it was never an official language.' ?
Yes - I think you can - in the sentence. But to actually start a new sentence?
It's like my use of 'but' above; and sometimes when we start a new sentence with 'and'. At times, we do for effect; but especially with 'yet', might it not be better after a semi-colon?
And in the context ('..., although') I don't see that it adds very much.
I have the impression that this use of "yet" can sound a bit dated - Shakespeare certainly used it (when Othello is about to kill Desdemona: 'Yet I'll not shed her blood...')
So, in this case it's the same as 'nevertheless' or 'however', isn't it?
Yet used this way is a conjunction. As David suggests, it is not a good idea to start a new sentence with a conjunction (although plenty of people do - and get away with it.)
Why don't you let us have the sentence that precedes it?
As Bob says, this use may be considered a bit outmoded (yet it certainly hasn't fallen into disuse to my way of thinking).