I agree with you that adverbs of number can't express frequency. However, I'd say that the whole phrase "twice every year" expresses the frequency of your visits to Rome. When you say "twice every year", it's equivalent to saying "every six months", so you can't really separate "twice" from "every year" in this particular expression, I think.
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Ivanhrso you can't really separate "twice" from "every year" in this particular expression, I think.Thank you for your reply. I completely agree with you.
IvanhrNot quite, I'm afraid. Expressions such as every week, every day, every month, every hour and so on certainly express frequency whereas others like many times, a few times etc don't.Yes of course. What I meant was that, if for the present perfect I want to mention the number of times + the frequency with which the actions or situations have happened at