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I just read this in a novel, and the sentence goes something like this

Perhaps she did have asthma

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    When to do is used as an auxiliary verb (in your example, to provide emphasis over and above the simple statement She had asthma), you only inflect do for tense/number. The primary verb (to have, in this case) should be a simple infinitive form (but note that in such constructions we don't include the "infinitive marker" to). – FumbleFingers May 16 '17 at 15:35
  • That is simply not true: Perhaps she did like to ride motorcycles. – Lambie May 17 '17 at 20:45
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    @Lambie That auxiliary verb is connected to the primary verb "to like" not "to ride," so the statement is still completely true. – Poik Jun 28 '18 at 14:27
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She did have. >>> You can only use the original form of the verb after the verb "do".

Grammatically, you can even say "she does do sth." >> Means "She indeed does sth."

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While you may think

She +has asthma.

should be together, that is the present tense. However, your sentence is in the past tense

She had asthma.

When formed with did + infinitive root creates the *past

She did have asthma.

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Auxiliary verbs in declarative sentences are used to emphasize the idea expressed by the verb, when the verb takes an auxiliary. Emphasis for tenses where auxiliaries are part of the sentence is heard through intonation only.

1) Perhaps she had asmthma. → Perhaps she did have asthma.

2) They read a lot of books last summer. → They did read a lot of books last summer.

3) They've been swimming a lot lately. → They have been swimming a lot lately.

In cases like this, the long form of the verb may be used in writing but when speaking, the auxiliary is stressed more if one wants to emphasize the idea about swimming.

4) We'd love to see them tomorrow. → We would love to see them tomorrow.

Again, the would cannot be shortened if you are emphasizing this with intonation. Otherwise, one would most likely shorten it. We'd etc. 5) They have a huge house. →They do have a huge house.

  • Whoever has downvoted this doesn't know how English works. It's pathetic. – Lambie May 17 '17 at 20:44

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