You must/mustn't keep to the right.
You must keep to the right.
At the concert hall, you ___ turn off your cell phone.
At the concert hall, you must turn off your cell phone.
We must/mustn't take photos. It's not allowed.
We mustn't take photos. It's not allowed.
While on a rollercoaster ride, you __ stand up.
While on a rollercoaster ride, you mustn't stand up.
At the theater, you __ be quiet.
At the theater, you must be quiet.
At the museum, you __ touch the items on display.
At the museum, you mustn't touch the items on display.
At the art gallery, you ___ photograph the paintings.
At the art gallery, you mustn't photograph the paintings.
You must/mustn't smoke here.
You mustn't smoke here.
You must/mustn't feed the animals at the zoo. It's dangerous.
You mustn't feed the animals at the zoo. It's dangerous.
In the zoo, you __ touch the animals.
In the zoo, you mustn't touch the animals.
You must/mustn't turn right.
You must mustn't turn right.