Auxiliary Verbs: Have, Do, Can and Short Responses
Use auxiliary verbs in questions, negatives, emphasis, ellipsis, and short responses such as I think so and I hope not.
Learning Objective
Auxiliary Verbs: Have, Do, Can and Short Responses
Choose an auxiliary that matches the tense or modal meaning and form natural short responses without repeating a full clause.
Clear Explanation
Auxiliary verbs carry tense, modality, negation, and question structure. In short responses, reuse the relevant auxiliary or replace a recoverable clause with so or not.
Form and Structure
auxiliary + subject; subject + auxiliary; verb + so/not
“Have you finished? Yes, I have.”
Patterns differ by verb: I think so and I do not think so are usual, while I hope so and I hope not are usual. Treat these as constructions, not completely interchangeable formulas.
Meaning and Use
Matching auxiliaries
A short answer repeats the auxiliary used or implied in the question.
“Do they agree? Yes, they do.”
Ellipsis
An auxiliary can stand for a longer verb phrase that listeners can recover.
“I have not called, but she has.”
So and not
After verbs such as think, hope, and suppose, so or not can replace a clause.
“I suppose so.”
Common Errors and Meaning Traps
Have you called? Yes, I do.
Have you called? Yes, I have.
The short answer must match the present-perfect auxiliary have.
She can drive, and I can drive too.
She can drive, and I can too.
The auxiliary can replaces the recoverable verb phrase can drive.
Will they cancel it? I hope so not.
Will they cancel it? I hope not.
Use hope not, not hope so not, for a negative short response.
Guided Practice
Use the grammar in context
“She can swim, but I cannot.”
“Will it rain? I hope not.”
Write four short exchanges using do, have, a modal auxiliary, and hope or think with so or not.
Quick Recap
Auxiliary verbs carry tense, modality, negation, and question structure. In short responses, reuse the relevant auxiliary or replace a recoverable clause with so or not.
A short answer repeats the auxiliary used or implied in the question.
Patterns differ by verb: I think so and I do not think so are usual, while I hope so and I hope not are usual. Treat these as constructions, not completely interchangeable formulas.
The short answer must match the present-perfect auxiliary have.
Independent Mastery Check
Complete these four checks before taking the quiz. If one feels difficult, return to the matching section and try again.
Explain the core rule in your own words without looking back at the lesson.
Find the target form in “Have you finished? Yes, I have.” and explain what it communicates in this context.
Explain why “Have you called? Yes, I have.” is the recommended revision for “Have you called? Yes, I do.”.
Write four short exchanges using do, have, a modal auxiliary, and hope or think with so or not.
Continue at B1-B2 Level
Aim for at least 5 out of 6 in the quiz below. For every missed answer, read the explanation, return to the relevant section, and try the quiz again.
Which statement best explains Auxiliary Verbs: Have, Do, Can and Short Responses?
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