In front of a brick house with a straw roof and some figures, three children stand, two of them holding squares of blackboard.
The children are doing schoolwork on the black boards
They can do other works than schoolwork on the board also.
Just because In front of a brick house with a straw roof and some figures, three children stand, two of them holding squares of blackboard does not mean they are doing schoolwork.
Children can hold black boards without doing schoolwork on them.