Identify the type of Adverb.
He goes to school regularly.

Let us explore the given options:

• Adverb of frequency describes how often an action happens.
- I have told you twice.
- He frequently comes unprepared.
- He goes to school regularly

• Adverb of degree tells us about the intensity of something.
-These mangoes are almost ripe.
- He is good enough for my purpose

• Adverb of manner tells us how something happens.
- The child slept soundly.
- I was agreeably disappointed.

• Adverb of Affirmation is a word that declares that something is true or some equivalent expression or negative statement, judgment, or a logical proposition.
- Surely you are mistaken.
- He certainly went.

[Source: High School Grammar & Composition, Wren & Martin]