A1 — Beginner+50 XP available

Interactive Grammar: Can and Cannot

Use 'can' and 'cannot' to express ability, possibility, and permission in present and future contexts.

Grammar Explanation · Authentic Examples · Practice Exercises

Lesson progressNot started

Duration

~64 min

Exercises

Level

Beginner

Overview

Use 'can' and 'cannot' to express ability, possibility, and permission in present and future contexts.

Can / Can't

abilityShe can speak three languages.
permissionCan I use your phone? / You can't park here.
possibilityIt can get very cold in January.
requestCan you help me with this?

Cannot / Can't

Cannot (formal) = can't (informal)
Inability: I can't swim. / She cannot drive.
Prohibition: You can't smoke here.
'Can' has the SAME form for all persons — no 's' in third person.

Common Mistakes

❌ She cans play the piano. → ✅ She can play the piano.
❌ He can to drive. → ✅ He can drive. (no 'to')
❌ Can she swims? → ✅ Can she swim?

When to use

Talking about ability

I can speak French and Spanish.

Rules & prohibition

You can't use phones in the exam.

Requests & offers

Can I help you?

Possibility

The weather can change very quickly here.

Frequently Asked Questions

What does this lesson on modals cover?

Use 'can' and 'cannot' to express ability, possibility, and permission in present and future contexts.

Which CEFR level is this lesson designed for?

This lesson is designed for Beginner (A1) learners and forms part of the Modals section on Grammartier.

What is the best approach for studying this grammar topic?

Start with the definition, then study the examples carefully to understand how the pattern works in context. Practise identifying the structure in authentic sentences before producing your own — this recognition-first approach builds a strong foundation for accurate, confident use.