When do we use must?, to express prohibition, to express duty/strong obligation , strong advice, to express strong necessity/ obligation, to suggestions / requests, When do we use can/may/might/could?, to ask for or give permission , to express possibility, to requests / suggestions, to express lack of necessity/ obligation, to express necessity, When do we use mustn’t / can’t ?, to express lack of necessity, to express prohibition, to express strong necessity/ obligation, to express duty/strong obligation, to express strong advice, When do we use can?, to express lack of necessity/obligation, to ask for or give permission, to express possibility, to express lack of necessity, to suggestions / requests, When do we use needn’t ?, to express duty/ strong obligation, strong advice, to express prohibition, to express necessity, to express lack of necessity, When do we use don’t have to?, to suggestions/ requests, to express lack of necessity/ obligation, to ask for or give permission , to express possibility, to express strong necessity/ obligation, When do we use need?, to express lack of necessity, to express prohibition, to express necessity, to suggestions / requests, When do we use have to?, to express necessity, to express strong necessity / obligation, to express lack of necessity / obligation, to express duty/ strong obligation, strong advice

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