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'Sometimes' is a very flexible adverb of frequency. Not all behave like it, though. 'Never' rarely takes end position and you have to invert the verb and subject if you put it at the beginning.
'Sometimes' is a very flexible adverb of frequency. Not all behave like it, though. 'Never' rarely takes and position and you have to invert the verb and subject if you put it at the beginning.
Do you mean that never rarely takes the end position?
Never at the beginning of the sentence:
Never does that ever happen.
Never at the end of a sentence:
That happens never!
I would use the second one only in a poem or for a rhetorical flourish.
adverb position 
Linear Mode
