So tonight is straightfoward............
I'll do this team by team...
Germany - will qualify with a win or a draw. They will also go through with a 3-2 defeat, or a higher-scoring one-goal loss. They're out if Portugal beat the Netherlands, but through if the Portuguese do not claim three points.
Denmark - a win sees them qualify. A draw will only be enough if Netherlands beat Portugal. Lose, and they're out.
Netherlands - only a win will do, and even that might not be enough. They have to win by more than one goal and hope Germany beat Denmark.
Portugal (ie. the complicated one) - a win secures qualification unless Denmark beat Germany 3-2, or by a higher-scoring one-goal margin. They'll go through with a draw if Denmark do not beat Germany. A one-goal defeat would still see them through if Germany beat Denmark, but if it is by any more they are out.
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Simples.........