Say what you must or mustn t do 1)walk on the grass in the park 2)help people 3)speak on the mobile in class 4)take photos in the museum 5)look after the pets well 6)go to bed very late 7)talk with friends in the lesson 8)shout at people

You must - help people, look after the pets well.
You mustn't - walk on the grass in the park, speak on the mobile in class, take photos in the museum, go to bed very late, talk with friends in the lesson, shout at people.

mustn't:
1)Walk on the grass in the park - ходить по траве в парке
3)speak on the mobile in class гогворить по мобильному телефону в классе
4)take photos in the museum - фотографировать в музее
6)go to bed very late - ложиться спать очень поздно
7)talk with friends in the lesson - болтать с друзьями на уроке
8)shout at people - кричать на людей
must:
людям
5)look after the pets well - хорошо ухаживать за домашним животным