Modal verbs for obligation and permission
Help
A tourist guide has to / doesn't have to find solutions to problems quickly.
A tourist guide has to find solutions to problems quickly
You can / can't wait for me here – I'll be right back.
You can wait for me here – I'll be right back.
He mustn't / doesn't have to wear suits every day but he likes smart clothes.
He doesn't have to wear suits every day but he likes smart clothes
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