walk on the grass
You mustn't walk on the grass.
walk on the path
You must walk on the path
pick the flowers
You mustn't pick the flowers.
wash your hands
You must wash your hands.
water the flowers
You must water the flowers.
swim in the fountain
You mustn't swim in the fountain.
drop litter
You mustn't drop litter.
put litter in the bin
You must put litter in the bin.
cut the trees
You mustn't cut the trees.
look after (доглядати) the animals
You must look after the animals.
