Forming questions in English requires a structural change that does not exist in many languages — moving the auxiliary verb before the subject. This is called inversion. It is one of the most fundamental grammar points in English, and errors with it are extremely common. Understanding how and why it works helps teachers explain it clearly and correct errors with confidence.
Before you start — think honestly about your own teaching and experience.
Look at the examples. Answer each question before reading the explanation — this is how your students will learn too.
Read these pairs of sentences. The first is a statement. The second is a question. What has changed between the statement and the question?
In each case, the verb 'be' (is/are/was/were) has moved to the front of the sentence — before the subject. In the statement: subject + be. In the question: be + subject. This is called inversion: swapping the normal order. When the verb is 'be', it moves directly to the front. No extra word is needed. The rule for be questions: move be to the front of the sentence. Is she a teacher? Are they from Nigeria? Was the school open? This is the simplest type of yes/no question — and students who know it often try to apply it to all verbs. But other verbs need extra help.
Now read these pairs. The main verb is NOT 'be'. What is different about how the question is formed?
The word 'do' (or 'does' for he/she/it) appears at the front — before the subject. The main verb goes back to its base form — no -s ending. 'She likes' → 'Does she like?' (not 'Does she likes?'). 'He teaches' → 'Does he teach?' (not 'Does he teaches?'). Do and does are called auxiliary verbs — they are added to help form the question. They carry the tense (present) and the person agreement (does = he/she/it). The main verb loses its -s because does already carries that information. This is one of the most important rules: when you add does, the main verb must go back to its base form.'
Now look at past tense questions. What word appears, and what happens to the main verb?
'Did' appears at the front for all persons — no did/dids distinction. 'Did' already carries the past tense information. The main verb returns to its base form — not the past tense. 'She visited' → 'Did she visit?' (not 'Did she visited?'). 'He went' → 'Did he go?' (not 'Did he went?'). This surprises students — they have learned the past tense form and then are asked to remove it. The reason: 'did' already signals the past. Adding the past form of the main verb as well would be double-marking — like saying the past twice. English avoids this. Did = past. Main verb = base form. Always.'
| Tense / Form | Use / Meaning | Example | Key time words |
|---|---|---|---|
| Be (present) | Move be to the front | She is ready. → Is she ready? | is/are |
| Be (past) | Move be to the front | They were late. → Were they late? | was/were |
| Present simple (he/she/it) | Does + subject + base verb | She works here. → Does she work here? | does — main verb loses -s |
| Present simple (I/you/we/they) | Do + subject + base verb | They speak English. → Do they speak English? | do — main verb stays base form |
| Past simple (all persons) | Did + subject + base verb | He finished. → Did he finish? | did — main verb loses past form |
THE THREE MOST COMMON ERRORS — and why they happen:
1. 'DO YOU ARE HAPPY?' — using do with be:
Students learn the rule 'add do to make a question' and apply it to be. But be is its own auxiliary — it moves directly to the front.
2. 'DOES SHE WORKS?' — keeping -s after does:
Students add does (correct) but forget to remove the -s from the main verb.
3. 'DID SHE WENT?' — keeping past form after did:
Students keep the past form of the main verb after did — double-marking the past.
A USEFUL CLASSROOM RULE TO DISPLAY:
ONE signal of tense per sentence in a question.
Does = present (for he/she/it). Did = past. Be = moves to the front.
When you add the auxiliary, the main verb goes back to base form.
Is the main verb 'be'? → move be to the front. Is it a different verb, present tense, he/she/it? → does + subject + base verb (no -s). Is it a different verb, present tense, I/you/we/they? → do + subject + base verb. Is it past tense? → did + subject + base verb (not past form). Is 'do' used with 'be'? → wrong — remove do, move be instead.
Choose the correct question form. Think about which auxiliary is needed and what form the main verb should take.
Each question contains an error. Write the correct version and explain why — then reveal the answer.
Use this sequence directly in class — guided discovery, no textbook needed. Tap each step to mark it done.
STEP 1 — STATEMENT TO QUESTION (5 minutes): Write five statements on the board. Ask students to convert them to yes/no questions. Start with be sentences only.
STEP 2 — ADD THE DO FAMILY (8 minutes): Now give statements with non-be verbs. Students convert to questions.
STEP 3 — PAST TENSE QUESTIONS (5 minutes): Repeat with past tense statements.
STEP 4 — DO WITH BE ERROR DRILL (5 minutes): Write these wrong questions. Students correct them.
STEP 5 — STUDENT-GENERATED QUESTIONS (5 minutes): Students write five questions to ask a classmate about their daily life. They must use a mix of be, do/does, and did questions. Students interview each other, then report back. Listen for errors and address as a group.
Use directly in class — copy, adapt, or read aloud. No printing needed.
For each strategy, choose the option that best describes where you are now.
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