The following small-sided game has a lot of “real to the game” applications.
It starts as a 2 v 2 game. When the ball goes out of bounds off in your team’s defensive half, then your pair leaves the field.
As soon as the ball goes out or a goal is scored, another pair from behind your goal starts the play by dribbling onto the field. I like to have three sets of pairs on each side of the field.
Encourage each pair that is coming on to enter the field as soon as possible. This will create a lot of realistic 2 v 1 situations.
I say they are realistic because it creates a 2 v 1 with a trailing defender. That prevents the attacking team from slowing down and exploiting the numbers-up situation at a pace that is not realistic to the time they would have in a game.
I like to stop it early to teach them to recognize when the defenders are flat and also what combinations they can use to get in behind