The word demonstrate is a verb. The past tense is demonstrated.
Verb.
The word "demonstrate" can function as both a verb and a noun. As a verb, it is an action word that shows or proves something. For example, "She will demonstrate the experiment in class." As a noun, "demonstrate" can refer to a public display of group opinion or feeling, as in "The protest was a powerful demonstration of unity."
part of speech
The part of speech for this particular word is a noun.
The way someone would demonstrate policies would be by describing what the policy stands for and how it is enforced. This can be done in a speech or with a report.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.