Select a short text, dialogue of series of sentences you have been studying and write it on the board, gapping out grammar words such as prepositions, articles or linkers that the children tend not to remember. Divide the class into teams. The get a child to read the first sentence including the gapped word. Then get another child to read the next sentence and so on. Each time a child gets a gapped word right they win a point for their team. If they get the gapped word wrong, tell the class the right answer but don’t give a point to the team.