It is not necessary to have experience to do the job.  - You don’t have to have experience to do the job, It is obligatory for builders to wear hard hats here.  - Builders have to / must wear hard hats here, It is a good idea for Frank to work in the summer.  - Frank should work in the summer., In our school, teachers are not allowed to wear jeans.  - In our school, teachers mustn’t wear jeans., It isn’t a good idea to wear very informal clothes for a job interview.  - You shouldn’t wear very informal clothes for a job interview., It is not obligatory for our receptionists to speak French.  - Our receptionists don’t have to speak French., It is essential for Karen to be calm in her job.  - Karen must be calm at work., It is necessary for firefighters to be ready to help any time. - Firefighters have to be ready to help any time.,

Modal verbs of obligation, prohibition and advice (paraphrase)

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