Grammar learning sequence · Step 19 of 38

Modal Verbs for Kids

Modal verbs such as can, could, may, might, should and must help express meanings like ability, possibility, permission, advice and obligation. A modal is normally followed by the base form of the main verb.

Understand the idea

What this grammar skill means

The important skill is choosing the modal that matches the intended strength and meaning, not memorising a list. Children should compare close choices such as should versus must.

Why this skill matters

Modal verbs allow children to express shades of meaning rather than only facts: ability, possibility, permission, advice, necessity and prediction. This makes them important for both accurate grammar and more mature communication.

Core rules and patterns

  • Core modal verbs such as can, could, may, might, must, should, will and would combine with the base form of another verb and add meanings such as ability, possibility, advice, permission, obligation or prediction.
  • Modals do not normally take -s with third-person singular subjects and do not use do/does/did to form ordinary questions or negatives. The modal itself moves before the subject in questions.
  • Choosing the modal changes strength and stance. “You should check” gives advice; “You must check” expresses much stronger necessity or obligation.

See the rule in context

Worked examples

She can swim.

Can expresses ability and is followed by the base verb swim.

It might rain later.

Might expresses possibility without presenting the event as certain.

Should we leave now?

Should comes before the subject in the question and the following verb stays in the base form.

More examples

  • You should check your work.
  • She can swim.
  • It might rain later.

Common mistakes to watch

  • Adding -s or -ed to the verb after a modal.
  • Treating should and must as equal in strength.
  • Using can for every type of permission or possibility without considering context.

Watch for these

Tricky cases and useful distinctions

  • Some expressions behave similarly to modals but have different grammar, such as have to, be able to and be going to.
  • Modal meaning can depend on context. Must can express obligation in one sentence and a strong logical conclusion in another.

Try it

Short practice prompts

  1. 1.Choose a modal for advice, ability and possibility.
  2. 2.Rewrite one sentence to make the obligation stronger or weaker.
  3. 3.Explain why two modal choices change the meaning.

Questions parents often ask

Quick clarifications

Why do we say “She can swim,” not “She can swims”?

A core modal is followed by the base form of the main verb, so third-person -s is not added after can.

What is the difference between should and must?

Should often presents advice or a recommended action, while must commonly expresses a much stronger requirement or conclusion.

Continue the grammar pathway

← Previous: Simple Future with “will”Next: Independent & Dependent Clauses →
Simple Future with “will”Independent & Dependent Clauses

References and further reading

Sources used to check this grammar explanation

Tiny Steps writes the teaching explanation and examples independently. These references are provided for grammar definitions, usage patterns and further reading.

  • Modal verbs

    British Council LearnEnglish

    Reference for ability, possibility, permission, advice, obligation and related modal meanings.

  • English Grammar Today

    Cambridge Dictionary

    Broad grammar reference based on English Grammar Today and the Cambridge English Corpus.

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