Modal verbs — O/L English

What must I remember about Modal verbs?

• Modal verbs express obligation, necessity, recommendation, and prohibition: 'must', 'have to', 'should', 'ought to', 'must not', 'need not'.
• 'Must' expresses strong internal obligation or formal rules ('Students must wear school uniforms').
• 'Have to' conveys external obligation imposed by external authority, law, or circumstance ('We have to submit the forms before noon').
• 'Should' and 'ought to' express moral duty, advice, and best practices ('You should consume sufficient water daily').
• 'Must not' signifies absolute prohibition (forbidden), while 'need not' / 'don't have to' signifies absence of obligation (optional).

Test yourself (1 minute)

1. Prohibition vs lack of obligation trap

   Confusing 'must not' with 'need not' alters meaning drastically ('You must not pay' = it is forbidden to pay; 'You need not pay' = payment is free/optional).

2. School code of conduct writing (Paper 1 Test 7)

   Use modal verbs accurately to distinguish compulsory regulations from advisory guidelines.

Practise Modal verbs questions today

Must know

• Modal verbs are always followed by the base form of the verb without 'to' (except 'ought to' and 'have to'): write 'should avoid', never 'should to avoid'.

Source: NIE G.C.E. (O/L) English Language Syllabus (Grade 10, Unit 5)

What should I study first?

Next in the syllabus

Where does Modal verbs fit in the syllabus?

Grade 10 · Term 1