What is the one most common used adverb?

It's difficult to definitively say which adverb is the *most* common, as usage varies greatly depending on the context and type of writing.

However, "very" is a strong contender for the most commonly used adverb in general English. It's incredibly versatile, modifying adjectives, adverbs, and even verbs to intensify their meaning.

Here's why "very" is a popular choice:

* Simplicity: It's a short, simple word that's easy to use and understand.

* Versatility: It can be used in a wide range of contexts and with various parts of speech.

* Frequency: It appears in many different types of writing and speech.

Of course, other adverbs like "really," "too," "so," and "now" are also frequently used.

Ultimately, the "most common" adverb will depend on how you define "common" and what data you consider.