auxiliary verb

1. A verb that accompanies the main verb in a clause in order to make distinctions in tense, mood, voice or aspect.

   Auxiliar, Auxiliare, Auxiliarverb

   вспомога́тельный глаго́лvspomogátelʹnyj glagól

   допомі́жне́ дієсло́воdopomížné dijeslóvo

   a verb that combines with another verb in a verb phrase to help form tense, mood, voice, or condition of the verb it combines with

1. There is very little difference between the auxiliary verbs.

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2. The future tense is formed with an auxiliary verb.

   deDas Futur wird mit einem Hilfsverb gebildet. — Pfirsichbaeumchen

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3. Since this is a subject question, you don't need an auxiliary verb.

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4. This is a subject question, and therefore you don't use an auxiliary verb.

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5. This sentence is in the present perfect. 'have' is not a verb, but an auxiliary verb.

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regular