When words commonly used as prepositions ( on, off, in, out, up, down) do not have a noun or pronoun object, those words most often will function as : Adverbs
As we know adverbs can be defined as the words that are usually modified which means that they limit or restrict the meaning of the Verbs. Adverbs may also modify adjectives, other adverbs, phrases or even a full entire sentence. For example: The roads are very steep.
Most adverbs are formed by adding -ly to an . If the adjective already ends in -y, the-y usually changes to -i
for example : bold/ boldly, heavy/ heavily
The relative adverbs introduces subordinate clauses which do not form simple sentences by themselves.
For example : they go to bed when they want to.
To learn more about Adverb here
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