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.

For number 5, you can choose whether you want to use two prepositional phrases, or two adverb clauses. - The manager praised her employees for their dedication and for their willingness to work on ...