Unit 1.2
Introduction
[Introduction]
Form
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 | …? |
Example
[Example]
Use
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.