2

What would be the correct grammar? Should I use adverb after how?

How frequent you do this?

or

How frequently you do this?

3

You need the adverb frequently here, it needs agreement with the verb (do frequently):

How frequently do you do this?

For comparison: the adjective frequent would agree with a noun:

How frequent are your trips there?

  • It does not agree with the verb, it modifies the verb... – Lambie Nov 7 '19 at 16:58

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