Yes, and also TRUST that your partner knows what he is doing. Of course if you see your partner doing something stupid you can tell that to him, but there's no need to lose your trust becouse of that you see your partner camping at seek PU when you have said 1. Just tell him 1 again, if he just continues camping there, you can add some dramatical shouting marks and say like: 1!!!!!. If your partner is idiot enough to continue camping at the Pu, change partner.

Of course one team has to blunder, otherwise there would be no scores. You shouldn't lose your trust just becouse your partner blunders. Then just take more responsibility, control the center of the level more, DD and try to command your partner to do stuff.
Veg has given me a great example of this. He and an anonym player beat Sperry and sweet this way. Veg noticed that the anonym player wasn't quite experienced in teamplay, and realized that he had to take more responsibility. (which he doesn't need to take when playing with a 1337 teamplayer like Gry/Yax/r3p)
He commanded the anonym player to do stuff and when the player obeyed, the teamplay worked well.

Ok end of this discussion. Lol, Mave I can teach you more stuff if you like. Just contact me via Msn. In a few years you might reach my level