Yes, "could" can function as a helping verb in English. It is used to form the past tense or conditional mood in combination with a main verb.
The verb form for the noun 'handshaking' is to shake hands (shakes hands, shaking hands, shook hands), a verb-object combination.
The word hasn't is a contraction, a verb-adverb combination; a shortened form for 'has not'. Examples:He has not called. or He hasn't called.
The contraction "doesn't" is a shortened form of does not., a combination of a verb (or auxiliary verb) and an adverb.Example:This road does not go to Chicago.This road doesn't go to Chicago.
The word doesn't is a contraction, a shortened form for 'does not', a verb-adverb combination; the contraction is used as a verb or auxiliary verb. Example:This street doesn't go through to Broadway.
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"had been" is a helping verb combination used to form the past perfect tense in English. It is not used as a linking verb.
The verb form of 'nonconformity' is 'non-conform'. It is an intransitive verb.
The verb form of "involvement" is "involve."
The verb form of commentary is "commentate."
The verb of combination is combine.other verbs are combines, combining and combined.Some example sentences are:"We will now combine these two chemicals"."He combines the liquids"."We are combining the living and dining room together","They have been combined".
The verb form of intensity is intensify. As in "to intensify something".