It's is used to modify a verb and adjectives or another adverb

It's an adverb

Explanation:

hope it helps

have a great day

:)

peace, morning, sun glooming, sorrow, woe pardon’d, punished, more hence, talk, story. all of these three words have to do something with a depressed, regretful tone. woe is another word for misery, heartache, so all of these words are about unhappy feelings.