Modal Auxiliary Verbs
Modals change the “mood” of a sentence. They show ability, permission, obligation, or possibility. Review the 8 core rules below, then step into the arena!
1. The Golden Rule ⭐
Modals NEVER change form. You cannot add -s, -ed, or -ing to them. They are always followed by the base form of the main verb (V1).
Right: He can play.
Wrong: He can plays. / He cans play.
2. Ability 💪
Use Can to talk about present ability. Use Could to talk about ability in the past.
Present: I can swim very fast.
Past: When I was five, I could not swim.
3. Permission ✋
Use May for formal permission (with teachers/elders). Use Can for informal permission (with friends).
Formal: May I come in, Sir?
Informal: Can I use your pen, Rahul?
4. Possibility 🤔
Use May, Might, or Could to show that something is possible but you are not 100% certain.
Take an umbrella; it might rain today.
She may arrive late.
5. Advice & Duty 💡
Use Should or Ought to to give advice or talk about moral duty. (Ought is always followed by ‘to’).
Advice: You should sleep early.
Duty: We ought to respect our flag.
6. Obligation (Rules) ⚖️
Use Must or Have to when something is strictly necessary or required by rules/laws.
Rule: You must wear a helmet.
Necessity: I have to finish this project today.
7. Prohibition 🚫
Use Must not (Mustn’t) to show that something is completely forbidden or not allowed.
Warning: You must not touch the wet wire. Passengers must not smoke here.
8. Polite Requests ☕
Use Would, Could, or Shall to make polite offers, requests, or suggestions.
Offer: Would you like some tea?
Request: Could you open the window?
Modals Arena
Quiz Complete!
Your Final Score