Unit 1.2




To do can be used as an auxiliary verb or a main verb that has its own meaning. As a main verb it also forms the continuous form doing. [TO BE CHECKED WITH A LINGUIST.] To do is an irregular verb and in the affirmative, negative and interrogative form in present and past tenses it has these kinds of structures and forms:

To Do Affirmative

Subject + to do + …

Subject To Do in Present Simple To Do in Past Simple
I do did
You do
He does
She does
It does
We do
You do
They do

To Do Negative

Subject + to do + not + …

Subject To Do in Present Simple + not Short Form* To Do in Present Simple + not Short Form*
I do not don’t did not didn’t
You do not don’t
He does not doesn’t
She does not doesn’t
It does not doesn’t
We do not don’t
You do not don’t
They do not don’t

*The short form is used in spoken language or in informal writing.

To Do Interrogative

To do + subject + …?

To Do in Present Simple To Do in Past Simple Subject Question Mark
Do Did I …?
Do you …?
Does he …?
Does she …?
Does it …?
Do we …?
Do you …?
Do they …?




We use the verb to do as:

  • An auxiliary verb: to form negatives and interrogative of other verbs, as well as for emphasis and negative imperatives;
  • A main verb: in the meaning of to perform or to complete an action.




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