MUSTN'T - something which is absolutely forbidden, BE SUPPOSED TO - a rule which may not be respected, NOT HAVE TO - something which isn’t necessary, HAD BETTER - a threat/warning, 'D BETTER - a recommendation or an advice, MUST - an order to yourself, HAVE TO - a responsibility which is part of someone’s job, SHOULD - a suggestion,

A1 - Modal verbs & collocations

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