1. Q: How often do you jog ?
    A: I jog every day.

  2. Q: What days do you jog?
    A: I jog every day.

Which is correct?

  • What makes you think that only one is correct?
    – Hot Licks
    May 16 '16 at 1:50
  • How often do you jog? Twice a week. What days do you jog? Mondays and Thursdays. (Same basic answer as Hot Licks', but more helpful.)
    – Steven Littman
    May 16 '16 at 2:48

To determine which is correct you have to question your intention in asking the question. And yes, both can yield the same answer.

When asking "how often"...you are asking a question of frequency. Depending on the context of the question, most likely you will receive an answer including an adverbial of frequency (Src):

  • always
  • never
  • normally e.g. "Normally twice a day."
  • occasionally
  • often
  • rarely e.g. "Oh rarely. Maybe once a month with my friend Maria"
  • seldom
  • sometimes e.g. "Sometimes in the spring and summer."
  • usually e.g. "I usually jog 3 times during the weekdays and rest on the weekend."

That frequency is not necessarily bound by the "days of the week". The time boundary is a determined by the responder or the context of the conversation.

When asking a question beginning with "what..." you are asking for specificity or identification . The question "What days do you jog?" has already specified 'days'. Therefore your answers should come within the context of days of the week.

e.g. I jog on Sundays, Wednesdays and Fridays

(OR as in your example:)

I jog everyday.

If you changed the context, the answer could differ. For example, say you were asking a teammate in a multi-day marathon the same question. He/She might respond, "I jog on the first and last day."

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