What part of speech is far in the sentence you went so far?

In the sentence "You went so far", the word "far" is an adverb.

Here's why:

* Adverbs modify verbs, adjectives, or other adverbs, providing information about how, when, where, or to what extent something happens.

* In this sentence, "far" modifies the verb "went", telling us to what extent the person went.

Let me know if you have any other word you'd like to analyze!