English Modal Verbs

The phrase 'not necessary' is synonymous with 'don't have to' (lack of obligation). 'Must not' implies prohibition, which is different.

The word 'prohibited' means something is forbidden, which is the definition of 'must not'.

The sentence requires a modal verb indicating inability. 'Can't' is the correct form for 'cannot'.

Option A is grammatically correct. The other options incorrectly include 'to' after the modal 'shouldn't'.

This is a second conditional sentence structure, which uses 'would' to describe a hypothetical result.

Option B is correct. 'Must' is a modal verb and is followed by the base form of the verb without 'to'.

'May' is the polite and standard modal verb used for asking for permission.

'Can' is used here to indicate possibility or ability.

'Would' is used in conditional questions to ask about a hypothetical situation.

The correct answer is 'Could' because this is a polite request using the modal verb of ability in a polite form. 'Would' is for willingness/hypothetical situations, 'Should' is for advice, and 'Must' is for obligation.

'Can't' is used to express inability. Elephants are physically unable to jump.

The phrase 'I need to check' implies uncertainty about the cat's health. 'Might' expresses possibility, whereas 'must' would imply a strong logical deduction or certainty.

Walking on grass is typically prohibited in public areas. 'Must not' is the correct modal to express a prohibition.

This is a second conditional structure. 'Would' is used in the main clause when the 'if' clause uses the past subjunctive 'were'.

Passing a test requires studying as a recommendation or necessity. 'Should' is the standard modal for giving advice or expressing a strong recommendation.

The sentence presents two options for the listener. 'Could' is used here to suggest possibilities or choices.