Modals

Overview

Modals are auxiliary (helping) verbs that express ability, permission, possibility, obligation, advice, or future intention. They are among the most frequently tested grammar topics in Bihar TET Language II, appearing in sentence correction, fill-in-the-blank, and transformation questions. Unlike regular verbs, modals do not change form—they never add "-s," "-ed," or "-ing"—and they are always followed by the base form of the main verb (V1).

Mastering modals requires understanding both their grammatical rules and their contextual meanings. A single modal like "could" can express past ability, polite request, or possibility depending on context. Bihar TET questions often test whether candidates can distinguish between similar modals (may vs might, shall vs will) and identify incorrect modal usage in sentences.

Key Concepts

• **Modals are invariable**: They never change form regardless of subject. "He can swim" not "He cans swim." Third person singular takes no "-s."

• **Base verb follows modals**: Always use V1 (infinitive without "to") after a modal. "She must go" not "She must goes" or "She must to go."

• **No two modals together**: You cannot combine modals directly. Wrong: "He will can come." Correct: "He will be able to come."

• **Question formation**: Invert modal and subject. "Can she dance?" No "do/does" required.

• **Negative formation**: Add "not" after the modal. "You should not lie." Contractions: can't, won't, shouldn't, mustn't.

• **Degrees of certainty**: Must (near certain) → should/ought to (probable) → may (possible) → might/could (less certain).

• **Present vs past reference**: Some modals have past forms (can→could, will→would, may→might), but context determines actual time reference.

Formulas / Key Facts

| Modal | Primary Uses | Example | |-------|-------------|---------| | **Can** | Present ability, informal permission, possibility | She can speak French. Can I leave? | | **Could** | Past ability, polite request, possibility (less certain than can) | He could run fast as a child. Could you help me? | | **May** | Formal permission, possibility (50%) | May I come in? It may rain today. | | **Might** | Possibility (weaker than may), past of may in indirect speech | He might arrive late. She said she might come. | | **Must** | Strong obligation, logical certainty, necessity | You must wear a helmet. He must be tired (certainty). | | **Shall** | Future (with I/we), formal offers, suggestions, legal/official language | Shall we go? The tenant shall pay rent monthly. | | **Should** | Advice, expectation, moral obligation | You should exercise daily. He should be here by now. | | **Will** | Future intention, willingness, habits, requests | I will call you. Will you close the door? | | **Would** | Polite requests, past habits, hypothetical situations, conditional | Would you mind waiting? He would often visit us. | | **Ought to** | Moral duty, advisability (stronger than should), expectation | You ought to respect elders. The bus ought to arrive soon. |