The verb 'to do' is one of the most important verbs in English when asking questions. We use it for many things, but it has different things that is does.
- It is a main verb (What do you DO?) used to ask about someone's job.
- It is an auxiliary verb. (What Does she like?)
- It is used for closed questions (Do you play sport?) Yes/No questions.
- It is used as a past participle (What have you done?) For the present perfect and passive.
- It is also used for continuous tenses (What is she doing?) Present continuous.
The main reason why students use this incorrectly is the structure. The main reason is the other important verb 'to be' is often used. These 2 verbs cannot be used together.
TO DO is used with a simple verb. (Auxiliary verb DO in red. Main verb in Blue).
What does she eat?
Who do you work for?
When do you begin university?
Why do you come to class late everyday?
Which TV programs do you watch?
Where do you live?
Which type of books do you read?
We also use this when using the past simple.
Where did you go last night?
Why didn't you call me?
What did have for breakfast?
When did his flight leave?
This is only for questions. This is not used in positive sentences.
His flight does leave today = X incorrect. We do not need to use 'does' in a positive sentence. (His flight leaves today)
She does live in Paris. = X incorrect. (She lives in Paris)
She did go to France = X incorrect. (She went to France)
Please do the exercise to practice.