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2.2.1.1.3 do
2.2.1.1.3.1 Forms of do:
2.2.1.1.3.1.1 1st person & 2nd person singular and plural, 3rd person plural present tense: do
2.2.1.1.3.1.2 3rd person singular present tense: does
2.2.1.1.3.1.3 present participle: doing
2.2.1.1.3.1.4 past tense: did
2.2.1.1.3.1.5 past participle: done
Do is used as a helping verb with the simple present tense. Did is used as a helping verb with the simple past tense. In spoken English, negative forms of do are often shortened, for example do not is shortened to don't and did not is shortened to didn't.
2.2.1.1.3.2 Functions of do:
2.2.1.1.3.2.1 Do is used to form the negative of main verbs, by putting not after do and
before the main verb in its infinitive form. For example:
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I did not know John was coming to dinner last night.
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It doesn't matter if you win or lose. Give your best and you'll get back what is best for you.
2.2.1.1.3.2.2 Do is used to form questions, by putting the subject after do and before the
main verb in its infinitive form. For example:
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Do you want some orange juice?
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Where does she live?
2.2.1.1.3.2.3 You use do when you are confirming or contradicting a statement containing
do, or giving a negative or positive answer to a question. For example:
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They say they don't care, but they do (care).
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“Do you have a dog?”—“No, I don't (have a dog).”
2.2.1.1.3.2.4 Do is used to give emphasis to the main verb. For example:
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Mary does want to go on the trip.
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You did have your glasses with you.
2.2.1.1.3.2.5 Do is used to stand for the main verb in some constructions. For example:
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He speaks faster than she does.
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Philip reached the Peak before everyone else did.
2.2.1.1.3.2.6 Do is used to make tag questions. For example:
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You know Rosie, don't you?
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I'm sure they had some of the same questions last year, didn't they?