An auxiliary verb modifies the main verb to give more information about the main verb.

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The use of “has been”

In the sentence below, I am not sure if i should use "has been" or "is" or even "was": In the literature of wireless networks, node mobility has been leveraged for different purposes. or In the ...
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Example using “doing” as an auxiliary verb?

My textbook lists the forms of "do" including "doing" as auxiliary/helping verbs. I can't think of any example where it would be used as such. Can you?
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Are copulars considered linking, helping, or auxiliaries?

I'm having a hard time understanding why most people consider the infinitive to be and all of its verb base forms helping verbs. I've consulted multiple English grammar sites and forums, and most of ...
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“I wouldn't have <past particle verb> if you wouldn't have <past participle verb>” not commonly heard from natives, why? Wrong or uncommon?

In my native language we often use complex sentences expressions like this: "I wouldn't have gone there if you wouldn't have told me to go there". Now when I say that in English it feel a bit verbose ...
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Use of Do/Does with indefinite pronouns

I am new! We all know that we use does with third-person singular (noun or pronoun, (definite or indefinite), but I am really confused about two things: How can I know that the given indefinite ...