This is very good instinct, and you could. You could certainly declare that after. In the following sentence, however, best is an adjective:
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Your example already shows how to use best as an adverb. What is the difference between Best wishes and best regards? First, let’s take a look at the general meaning of best wishes and best regards: best wishes: part of speech is a phrase, used to express the best wishes for someone, usually used in formal occasions such as letters and greeting cards. Best wishes to you: I sincerely wish you my best wishes; best wishes to: give. . . . Best wishes; Example:please convey my best wishes to him.
It is also a superlative, like greatest, or highest, so just as you would use it as an adjective to show that something is.
What was best? if we insert the word the, we get a noun phrase, the best. Which one is the best is obviously a question format, so it makes sense that which one the best is should be the correct form.
