Qual é a diferença entre to differ e to vary ?Podes indicar apenas respostas exemplo.

1) Vary is usually used when comparing more than two items together e.g.
'Regional accents vary in the UK' this suggests there are a multitude of accents in the UK.
2) Differ is usually used when comparing two items to each other e.g.
'The currency used in Poland differs to the UK'
3) I agree with tiramisu that 'vary' suggests a greater inconsistency than 'differ'. If I said 'My opinion varies', this suggests that my opinion sometimes changes. If I said my 'My opinion differs' this would suggest that my opinion is simply different, there is no implication that this is likely to change.