Here are the sentences rewritten with modal verbs:
- Mystery shoppers have to review the service they get in shops.
- You must add your email to your CV.
- A security guard mustn't leave the shop.
- I don't have to learn the local language in my new job - everybody speaks English!
- As a hotel receptionist, I must answer the telephone and be well-organised.
- In my country, taxi drivers can't carry more than four passengers.