I'd appreciate it if anyone could tell me if there's any substantial difference in usage and meaning of 'each' / 'every' + day, week, month, year etc.
When I was in Venice, I went sightseeing every day.
When I was in Venice, I went sigtseeing each day.
YOu should test your eyesight every year.
You should check your eyesight each year.
Are they all fine?
Thank you in advance.
There is no substantial difference to me in those cases. All of them sound fine.