I always expect a win with an assertive tone, then i tell the players by postions i.e Attack, midfield and defence "i have faith" after a while they are all motivated after that speech. Loosing at half time, Aggresive "I am not happy with your performance" its either assertive or aggresive...there the only two i use and has worked wonders for me with no fails but could be different depending on the team and whether you choose international player or sunday league player as your manager rep