Negatives and questions
English negatives and questions are built through the finite auxiliary; when no auxiliary is present, do-support supplies one.
01 · Concept foundation
Understand the terms before applying the rule
Each term below names a different grammatical object. Open examples and compare their function rather than memorising a Vietnamese translation alone.
auxiliary/ɔːɡˈzɪliəri/
trợ động từA verb used with another verb to express tense, aspect, voice, modality, negation or interrogation.
be, have, do, can, may
be, have, do, can, may
do-support/ˈduː səpɔːt/
cơ chế dùng doThe use of do/does/did to carry tense in negatives, questions and emphasis when no other auxiliary is available.
Does the model converge?
Mô hình có hội tụ không?
subject–auxiliary inversion/ˈsʌbdʒɪkt ɔːɡˈzɪliəri ɪnˈvɜːʃən/
đảo chủ ngữ–trợ động từPlacing the finite auxiliary before the subject to form most English questions.
Has the survey finished?
Khảo sát đã hoàn thành chưa?
Complete lesson scope
Do not stop at one formula
Do-support, auxiliary inversion and negative placement
Yes/no, wh-, choice and subject questions
Short answers, question tags and echo questions
Indirect questions, imperatives and negative imperatives
Decision boundary: Indirect questions keep statement word order after the introductory phrase.
02 · Controlling rule
English negatives place not after the finite auxiliary, and most questions invert that auxiliary with the subject. Do-support supplies an auxiliary for simple present/past lexical verbs; subject questions do not use inversion, while indirect questions retain statement order.
S + AUX + not + V | WH + AUX + S + V? | subject-WH + V?Negatives and questions
Build negatives and questions through the finite auxiliary, use do-support only when required, and preserve statement order inside indirect questions.
The finite auxiliary carries grammar
Negation and most question formation operate on the first finite auxiliary. If a simple present or past clause has no auxiliary, do/does/did supplies one.
S + AUX + not + V | AUX + S + V?Place not after the finite auxiliary: has not finished, cannot converge.
Use do-support with ordinary lexical verbs in simple present and past negatives/questions.
After do/does/did, the lexical verb returns to the base form.
The model does not reproduce the observed peak.
- S: The model
- AUX: does
- NEG: not
- V: reproduce
Has the calibration been completed?
Question-building matrix
First decide whether an auxiliary already exists and whether the wh-expression is the subject.
| Clause type | Pattern | Example |
|---|---|---|
| Yes/no with auxiliary | AUX + S + rest? | Has the run finished? |
| Yes/no without auxiliary | Do/Does/Did + S + base V? | Did the level rise? |
| Object/adjunct wh-question | WH + AUX + S + V? | Why did the level rise? |
| Subject wh-question | WH-subject + V? | What caused the rise? |
| Indirect question | intro + WH/if + S + V | Do you know why it rose? |
Negative-form choices
Choose one grammatical negative per intended negation in standard edited English.
| Meaning | Preferred form | Avoid |
|---|---|---|
| Absence of a thing | no + noun / not any + noun | not no + noun |
| No person | nobody / not anybody | not nobody |
| Partial quantity | not all / not every | ambiguous all...not |
| Never at any time | never or have not ever | do not never |
High-risk contrasts
A past simple object/adjunct question needs did and a base verb.
Did already carries past tense, so the lexical verb uses the base form.
The embedded indirect question keeps statement order.
Use one grammatical negative for a single negation in standard English.
Concept and form check
Apply the system in context
Turn one academic statement into a negative, a yes/no question, an object wh-question, a subject question and an indirect question. Explain every auxiliary choice.
- ✓Identify the finite auxiliary before transforming the clause.
- ✓Use the base verb after do/does/did.
- ✓Keep statement order inside indirect questions.
03 · Worked examples
Observe form, function and meaning together
The model does not reproduce the observed peak.
Mô hình không tái hiện đỉnh quan trắc.
Why did the estimated peak change?
Vì sao đỉnh ước tính thay đổi?
Which parameter caused the instability?
Tham số nào gây ra bất ổn?
Could you explain why the boundary condition changed?
Bạn có thể giải thích vì sao điều kiện biên thay đổi không?
Not all stations produced complete records.
Không phải tất cả các trạm đều tạo hồ sơ đầy đủ.
04 · High-risk contrast
Explain why one form fails, not only which answer is correct
Could you tell me where is the station?
Could you tell me where the station is?
The matrix clause is interrogative, but the embedded indirect question keeps subject–verb statement order.
05 · Mastery check
Apply the rule before marking the lesson complete
Which sentence is grammatically acceptable in the target system?
Which description best defines “auxiliary”?
Which example is one of the verified target patterns in this lesson?
Which structural formula belongs to this lesson?
Complete all four checks, then submit a sentence for target-form feedback.
06 · IELTS Academic
Transfer grammar into a real communicative task
This system supports accurate research questions, cautious negative claims and clear examiner interaction without relying on memorised question frames.
Use do-support and the base verb correctly.
Distinguish subject questions from object/adjunct questions.
Build indirect questions with statement order.
Control partial negation and avoid double negatives.