Student or Learner
Stop littering on the ground.
My question is that must we use the verb 'litter' with 'on the ground' or is that not necessary because 'litter' means to leave waste paper, cans etc on the ground in a public place.
Litter is not necessarily left only on the ground.
The table/pond/roof was littered with paper bags and bits of food.
The car was full of bottles and other litter.
So "stop littering" covers all possible situations, including the ground.
not a teacher