The verb of extent is extend.
Other verbs depending on the tense are extends, extending and extended.
Some examples for you are:
"We will extend the contract".
"He extends his arm".
"I am extending it for you".
"We extended the house".
The noun extent is from the same root as the verb to extend (to reach, or to reach out). The extent of a reference is how far it extends, is extended, or is extending.
"Extent" is a noun, not a verb, and therefore does not have any past participle. The corresponding verb, "extend" has "extended" as its past participle.
Degree can be a noun or a verb. As a noun, it refers to a unit of measurement or the extent or level of something. As a verb, it means to demonstrate or measure the extent or amount of something.
"Big" is an adjective. It is used to describe the size or extent of something, such as in the phrase "a big house." It does not function as a verb.
"Widith" is a noun. It refers to the measurement or extent of something from side to side. It is not used as a verb or an adjective.
Adverbs of extent, e.g., "completely", modify verbs. Traditionally, though incorrectly, many other types of adverbs are taken to modify verbs, but most of these actually modify verb phrases or sentences. The best authority on this is James McCawley, "The Syntactic Phenomena of English", who shows, for instance, that a manner adverb such as "hesitantly" does not modify the verb of its sentence, but rather its verb phrase (unless of course the verb phrase happens to consist of a lone verb).
No, it is not. It is a verb form (the past and past participle of the verb expand) which can be used as an adjective meaning "increased in size, scope, or extent."
No, it is the past tense of a verb. Adverbs usually answer questions such as how?, in what way?, when?, where?, and to what extent?
No, "naturally" is an adverb, not a verb. Adverbs modify verbs, adjectives, or other adverbs by providing more information about when, where, how, or to what extent something happens.
No, "heavily" is an adverb. It is used to describe how an action is done or to what extent something is done.
No, "will go" is not an adverb. "Will go" is a verb phrase that consists of the modal verb "will" and the main verb "go." Adverbs typically describe how, when, where, or to what extent an action is done.
No. An adverb modifies a verb, adjective, or another adverb by telling how, when , where, why, or how much or to what extent