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I have a question about this sentence:

"The reason why I study English is because it is the language that binds us together."

I'm fairly sure this is correct, but I don't know how to explain why I had to use two auxiliary verbs. I need to know how to explain this and I've searched online but I'm probably using the wrong keywords since I can't find an answer. Could you please tell me why two auxiliary verbs are needed here?

  • Comments are not for extended discussion; this conversation has been moved to chat. – snailcar Jul 9 '17 at 12:56
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TL;DR It's fine to use more than one in a sentence.

If you're looking to explain it, note that you have two different subjects for the two verbs: "the reason is" and "it is". That's a good hint that you have two separate verb phrases. The two verbs aren't really constraining each other in any way — they could even be in different tenses.

In fact, you could use as many different auxiliaries in one sentence as you like!

I haven't yet told you that the reason why I've studied English all these years has never been because I've been enjoying it, but because my wife has never been committed to learning French.


Clarification

Note that neither of those instances of "to be" is traditionally considered an auxiliary (but see the appendix below for a different opinion).

The usual auxiliary verbs in English are indeed to be and to have. However, those can both also serve as main verbs: they can carry the main meaning of a verb phrase, not tense/aspect information. That's what they're doing here.

How do you know when they're auxiliaries? Because they will be followed by another verb, to make a compound tense. For example, has followed by a past participle makes the present perfect:

He has called his parents once a week since he moved out.

And is followed by a past participle makes the present passive:

Our little church bell is tolled to mark every wedding in town.

You can see that in your sentence, the only other verbs are "study" and "binds". Neither of them is by "is", so they're not relevant for any compound tense. So you have to be as the main verb.


Appendix

As others have noted, some grammar systems call "be" an auxiliary no matter what. The one @P.E.Dant linked to below seems to be an example. But however you slice the cake, at some point you have to draw a distinction between "to be" as a support for another verb vs. as an independent item ("non-core auxiliary", for example?).

It's worth nothing that in any case, "to be" behaves oddly for a verb in English, and so do similar words in many languages. Here it's a copula: it doesn't express an action like verbs are supposed to do, but declares an identity. You will see different grammar systems analyze it in very different ways.

The good news is that no matter which analysis is correct, you're okay to use more than one in the same sentence!

  • Comments are not for extended discussion; this conversation has been moved to chat. – snailcar Jul 9 '17 at 12:55

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