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Unit 6.2

37 Do: Auxiliary Verb

An auxiliary verb is a helping verb that has no meaning on its own but it gives functional and grammatical meaning to the main verb.

Do as a verb means to perform or to complete an action.

But, it can also be used as an auxiliary verb. Do as an auxiliary verb is used to form interrogative and negatives of other verbs, as well as for emphasis and negative imperatives.

The verb do as an auxiliary verb is followed by infinitives without to. There are three forms of auxiliary verb do depending on the subject and the tenses:

SubjectPresent SimplePast Simple
IDoDid
YouDoDid
HeDoesDid
SheDoesDid
ItDoesDid
WeDoDid
YouDoDid
TheyDoDid

 

Do as a verb

    • I always do my homework.
    • She did a great job.
    • They didn’t do anything yesterday.

Do as an auxiliary verb

  1. Negatives
    • I don’t speak Spanish
  2. Interrogative
    • Do you speak Spanish?
  3. Emphasis
    • She does look nice today.
  4. Negative imperatives
    • Don’t speak loudly!

Do as a verb means to perform or to complete an action.

Do as an auxiliary verb is used:

  1. To form negatives of other verbs.
  2. To form interrogative sentences of other verbs
  3. To give emphasis in an affirmative clause.
  4. To form negative imperatives in its negative form (don’t).

Do as a verb means to perform or to complete an action.

For example:
“I do a lot of work today.” = We use do as a verb here to explain that the subject completes an action.

Do is also an auxiliary verb that we can use to form negative and interrogative sentences of other verbs. It is also used in an affirmative sentence to give emphasis. In its negative form (don’t), it can function as negative imperatives.

For examples:
— Negatives: “I don’t like football.”= We use do as an auxiliary verb before the main verb to form a negative sentence.
— Interrogatives: “Do you live in Brussels?” = Do as an auxiliary verb is put before the subject to create an interrogative.
— Emphasis: “You do look tired.” = We use do as an auxiliary verb before the main verb in an affirmative sentence to give an emphasis.
— Negative imperatives: “Don’t talk to me!” = Do in negative form (don’t) is used to form a negative imperative.

NOTE: We always use the negative form (don’t) for negative imperatives and it is always put at the beginning of the sentence.

Let’s revise this content in {Form} section. Take a look at {Example} section that shows its use within a context sentence.

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