As a manager, seeing your team trailing by 3 goals in the first won't be funny at all.

If a manager starts a game with a 433 formation and at the end of the first half, his team is down with 3 goals, the best thing to do is pull out a defender and inject more of an attacking players and switch to either 343 or 334 formation to create more chances to score and equalize the game.

Thanks all