The one thing United manage to do well, and in fairness they do so many things badly you'd expect at least one thing. But their defence when on the back foot manages to stay quite compact, block the route to goal for a shot, get in the way of a cross. They want you to snatch at shots as it gives them a better chance of defending as the attack becomes quite basic.
Liverpool just need to stay composed and hold out for that extra pass instead of shooting straight away all the time, find a way to stretch or move that backline around, and then they'll score.