Learn English Grammar and Vocabulary
Uses of Do
As a principal verb
As a principal verb do is used in the sense of perform or act.
- We must do our work well.
- Do as I tell you.
- Can’t you do it yourself?
As an auxiliary verb
As an auxiliary verb, do is used in three ways.
1) to ask a question
- Do you know where he works?
- Did he ask your name?
- Do they take him for an expert?
2) to form a negative statement
Sentences in the simple present and simple past form their negatives with do, does and did.
- I saw him yesterday.
- I did not see him yesterday.
- She sent me a present.
- She did not send me a present.
- I want to talk to him.
- I don’t want to talk to him.
To emphasize an assertion
- I admit that I was wrong. (Less emphatic)
- I do admit that I was wrong. (More emphatic)
- She looks rather shabby.
- She does look rather shabby.
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