
Ed M. answered 10/14/15
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Help with grammar, French, SAT Writing, the TOEFL and ESL.
In the sentence the adverb We had met somewhat earlier than you think, somewhat modifies the (comparative) adverb earlier.
The word earlier could also be used an adjective, e.g., We took the earlier bus where the adjective earlier modifies the noun bus, but in the sentence you gave earlier is clearly an adverb since it supplies the classic "adverby" information about the time that the action of the main verb in the sentence, met, took place.