can/cant/should/shouldnt
It’s a good idea to book tickets in advance before going on a trip.
You should book tickets in advance before going on a trip.
It isn’t possible to pay in cash at this hotel. They only accept credit cards.
You can't pay in cash at this hotel.
It is possible to go sightseeing in the city center. There are many attractions.
You can go sightseeing in the city center.