Verb?

[Unregistered]

Sentence:

I think; therefore, I am.

Question:

Where is the adverb???

[boothling]

There is no adverb. You don't always need an adverb.

[MikeNewYork]

Sentence:

I think; therefore, I am.

Question:

Where is the adverb???

"Therefore" is the adverb. It is a special kind of adverb, a conjunctive adverb, so named because it connects two statements.