The Function of TO DO as Auxiliary or Main Verb

Function of To Do

       The Function of TO DO as Auxiliary or Main Verb. A sentence is a group of words usually ​containing a ​verb, that ​expresses a ​thought in the ​form of a ​statement, ​question, ​instruction, or ​exclamation which, when they are written down, begin with a capital letter and end with a full stop, question mark, or exclamation mark.

        From the meaning of sentence above, we can conclude that verb plays important role in a sentence, however, sometimes we find weather the word is verb or not especially the word “DO” and “HAVE”. For that, in this occasion I want to share about the function of TO DO.

       Before discussing about TO DO, I want to discuss about the meaning of auxiliary. What are auxiliary verbs? Auxiliary verbs are also called helping verbs. Auxiliary verbs are used to help/assist the main verb of the sentience.

Now let’s discuss about TO DO.

  1. Kinds of TO DO

There are four kinds of TO DO, they are:

PresentPastPast Participle


Did  Done  


 It can be difficult to understand the meaning.

I do my homework after prying isya’.

She does not write a letter.

We did not play in the yard.

He has done his work.


  1. The function of TO DO

There are two functions of TO DO. They are:

A.   As Auxiliary

TO DO can be function as auxiliary when there is a main verb (verb) after TO DO in a sentence. In this case auxiliary TO DO should be followed by infinitive verb (verb 1). For this function, TO DO is just used in Negative and interrogative form.

So the pattern (formula) is:

Subject + Do/Does + not + Verb1 (negative form)


I do not speak French.

She does not play a game.

They do not clean the room.

Do/Does + Subject + Verb1 (interrogative form)


Do You speak French?

Does she play a game?

Do they clean the room?


“Do” is used for subject I, You, We, They, Rina and Toni, cats, flowers, etc.

“Does” is used for subject She, He, Rina, Toni, A cat, A flower. Etc.

  • Did + verb1 (the sentence is in Simple Past Tense). And the complete formula is

Subject + Did + not + Verb1 (negative form)


I did not speak French.

She did not play a game.

They did not clean the room.

Did + Subject + Verb1 (interrogative form)


Did You speak French?

Did she play a game?

Did they clean the room?


B.   As Main Verb

TO DO is function as Main Verb or Full Verb (commonly called Verb) when there is no main verb (verb) after TO DO in a sentence. In this case TO DO is directly followed by object or adverb.


We do my task at home.

I did carefully.

She does not do her work in the office. (does = auxiliary, do = verb)

They have done their duty.


       That’s all I can share about TO DO. Hopefully it will be useful. And thanks for visiting this web.

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