Talk to the dog like he is a human adult. Do not raise or lower your tone of voice at any time but try smiling when you talk to him, seriously - smile while you talk. Also, when it is time for him to eat, should still be getting 2 meals a day, take the pup into a closed room by yourself and feed him his meal by hand - from a spoon if it is wet food. If you have a tiled floor ( like in a bathroom) then you can start by dropping a small spoon full a little way away from you. Keep this distance until you can see the pup is happy and then bring the food drops closer and closer but slowly - over days rather than hours.
When you walk the dog always have tasty treats in your pocket and give him lots of rewards - every few paces to start with.
If you get to play any sort of game, remeber to reward him liberally for playing with you.
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