Modal Verbs of Ability: Can & Could
Can and could are the two core modal verbs for expressing ability in English. After this page you will know how to use them for present and past ability, polite requests, and theoretical possibility — and you will never confuse could with was able to again.
Modal Verbs of Advice: Should & Ought To
Should and ought to are the two core modal expressions for giving advice and recommendations in English. After this page you will know how to use them to give advice, express expectations, criticise with shouldn't, and talk about past regret or criticism with should have.
Modal Verbs of Obligation: Must & Have To
Both must and have to express obligation in English, but they are not interchangeable — one comes from inside, the other from outside. After this page you will know which to use when, how to express prohibition and no-obligation correctly, and why must needs a substitute in the past and future.
Perfect Modals: Modal + Have + Past Participle
One structural pattern — modal + have + past participle — unlocks seven distinct meanings in English. After this page you will command the full system: past deduction, unrealised past possibility, regret, criticism, and unnecessary past action.
Modal Verbs of Permission: May, Can & Could
Three modal verbs — may, can, and could — all express permission in English, but they are not always interchangeable. After this page you will know which one to use when, how to give and refuse permission correctly, and how to avoid the critical can't vs don't have to confusion.
Modal Verbs of Probability: Might, May & Must
Modal verbs let you do more than state facts — they let you reason out loud. After this page you will know how to use must for strong deduction, can't for near-certain negation, and may, might, and could for expressing possibility in the present, past, and future.
Modal verbs in English: meanings and forms
Modal verbs are a closed category — English has only ten core modals (can, could, may, might, must, shall, should, will, would, ought to) plus semi-modals like need to and be able to. Despite this small number, they cover an enormous semantic range: ability, permission, possibility, probability, obligation, prohibition, advice, and volition. The same modal can express different meanings depending on context.
At B1 level, learners consolidate the meaning differences between common modals. At B2, the modal perfect constructions (should have done, might have been, must have happened) become central — these are heavily tested in FCE and IELTS Writing tasks. At C1, learners handle semi-modals (be bound to, be supposed to), used to vs. would for past habits, and the subtle probability gradations between may, might, could, must, and will.
The guides on this page cover each modal or modal group with clear tables showing the range of meanings, the corresponding verb forms, and worked examples in multiple registers.