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Why do the words "Should or Does" impact the conjugation of its following verb? For example

My brother gets up in time.

My brother should get up in time.

My brother does get up in time.

The simple conjugation of the verb should be

I get

You get

He, she, gets

Why does using the word should or does change the conjugation of the verb?

  • Why are you writing "get" like that with quotation marks? – Michael Harvey Feb 12 '19 at 18:48
  • You only need one marker for tense and person. When you have a helper verb, that's the one that takes that marker. The main verb then stays in the infinitive. "She gets", "he got"; "it has". But "she does get", "he did get", "it doesn't have". Now, modal verbs like should don't have a marker for person, but that's a separate issue altogether. "I should, we should, he should" — it is always the same. But that doesn't affect the main verb. It has to be in the infinitive because you're using a helper verb. And so it stays in the infinitve no matter what happens to that helper verb. – ЯegDwight Feb 12 '19 at 20:03
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Because does and should are verbs themselves - auxiliary verbs in this case - and they conjugate according to subject. They then take a bare infinitive, the primary verb, the one they are auxiliary to.

So:

I get up

He gets up

and

I do get up

He does get up

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Should get up means it is something that ought to happen, but it has not happened yet. The person is still in bed or still sitting down:

She should get up so I can make the bed!

She does get up is similar in meaning to She gets up, except you are emphasizing that this is an event that is happening. It implies that you are wondering whether or not she got up yet. For example:

If she does get up, tell her to make her bed!

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