Modals
Overview
Modals are auxiliary (helping) verbs that express ability, possibility, permission, obligation, or prediction. In CG TET Paper I and Paper II, modals appear frequently in grammar-based questions—either as fill-in-the-blanks, error correction, or sentence transformation items. Understanding the subtle differences between similar modals (can vs may, must vs should) is essential for scoring well.
The nine core modals tested in CG TET are: **can, could, may, might, must, shall, should, will, would**. Each carries a distinct shade of meaning, and exam questions often test whether candidates can select the correct modal for a given context. Mastery here also supports the pedagogy section, as teachers must explain modal usage clearly to young learners.
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Key Concepts
- **Modals never change form**—no -s, -ing, or -ed endings. We say "She can swim," not "She cans swim."
- **Modals are always followed by the base form (V1)** of the main verb. Example: "He must go," not "He must goes" or "He must to go."
- **Modals do not require auxiliary verbs** for questions or negatives. We say "Can you help?" not "Do you can help?"
- **Degrees of certainty differ**: must (near-certain) > will (high confidence) > should (reasonable expectation) > may/might (possibility) > could (remote possibility).
- **Can vs May**: Can expresses ability; may expresses permission or possibility. Formal usage prefers "May I leave?" over "Can I leave?"
- **Must vs Have to**: Must shows internal obligation or strong inference; have to shows external obligation. Only must is a pure modal.
- **Shall vs Will**: Shall is used with I/we for offers, suggestions, or formal future; will is used with all subjects for simple future or willingness.
- **Would** often appears in polite requests, hypothetical situations, and past habits.
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Formulas / Key Facts
| Modal | Function | Example | |-------|----------|---------| | **Can** | Ability (present), informal permission | She can speak French. / Can I sit here? | | **Could** | Past ability, polite request, possibility | He could run fast as a child. / Could you help me? | | **May** | Permission (formal), possibility | May I come in? / It may rain today. | | **Might** | Weaker possibility, polite suggestion | He might be late. / You might try again. | | **Must** | Strong obligation, logical certainty | You must wear a helmet. / She must be tired. | | **Shall** | Offer/suggestion (I/we), formal future | Shall I open the window? / We shall overcome. | | **Should** | Advice, expectation, mild obligation | You should exercise daily. / He should arrive by 10. | | **Will** | Future intention, willingness, promise | I will call you. / Will you marry me? | | **Would** | Polite request, hypothetical, past habit | Would you pass the salt? / I would visit her every Sunday. |
**Negative forms**: can't / cannot, couldn't, may not, might not, must not (mustn't), shall not (shan't), should not (shouldn't), will not (won't), would not (wouldn't).
**Question formation**: Modal + Subject + V1. Example: Should we start?
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Worked Examples
### Example 1: Fill in the blank
**Q.** You ______ not park here. It is a no-parking zone. Options: (a) can (b) must (c) might (d) would
**Solution:** The sentence expresses a prohibition (a rule). Strong prohibition uses **must not**. **Answer: (b) must**
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### Example 2: Error correction
**Q.** Find the error: "She must to finish her homework before dinner."
**Solution:** Modals are followed by the base verb, not "to + verb." Correct sentence: "She must finish her homework before dinner." **Error:** "to" after must.
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### Example 3: Choose the correct modal
**Q.** When I was young, I ______ climb trees easily. Options: (a) can (b) could (c) may (d) might
**Solution:** The sentence refers to past ability ("When I was young"). Past ability is expressed by **could**. **Answer: (b) could**
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### Example 4: Transformation
**Q.** Rewrite using a modal: "It is possible that he is at home."
**Solution:** Possibility is expressed by may/might. Rewritten: "He may be at home." or "He might be at home."
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Common Mistakes
1. **Adding "to" after modals** → Wrong: "He can to swim." Fix: Modals take the bare infinitive—"He can swim."
2. **Using "could" for present permission** → Wrong: "Could I borrow your pen?" is polite but often mistaken as past. Fix: Recognize that "could" is also used for polite present requests, not only past ability.
3. **Confusing "may" and "can" in formal contexts** → Wrong: "Can I leave early, sir?" in formal writing. Fix: Use "May I leave early, sir?" for formal permission.
4. **Using "must" for past obligation** → Wrong: "Yesterday, I must complete the work." Fix: Must has no past form; use "had to"—"Yesterday, I had to complete the work."
5. **Mixing "will" and "shall" randomly** → Wrong: "Shall you come tomorrow?" Fix: Use "Will you come tomorrow?" Shall is mainly for I/we in offers or suggestions.
6. **Double modals** → Wrong: "He might can do it." Fix: Use only one modal—"He might do it" or "He can do it."
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Quick Reference
- Modals + V1 (base form) — never "to + verb" or verb with -s/-ed.
- **Can** = ability now; **Could** = ability in past OR polite request.
- **May** = formal permission / possibility; **Might** = weaker possibility.
- **Must** = strong obligation / near certainty; no past form—use "had to."
- **Should** = advice / expectation; **Would** = polite request / hypothetical / past habit.
- **Shall** with I/we for offers ("Shall I help?"); **Will** for general future.