Ah, the adverb train station. If you want to find out about adverbs, there is no better place. An adverb tells you how something happens. Here is a train moving "quickly" on the track.

A relative clause can be introduced by either a relative pronoun or a relative adverb. A relative clause can be restrictive or nonrestrictive (essential or nonessential) Restrictive relative clauses ...

Ah, the adverb train station. If you want to find out about adverbs, there is no better place. An adverb tells you how something happens. Here is a train moving "quickly" on the track.