Can your dog understand you?

I really believe that dogs can understand certain words. NOt just the ordinary commands (sit, stay, heel), but words that we use everday. I am sure that my chowgle knows Let's get um up ....for time to get the twins up Do you want a treat....for let's get a treat Go Outside....means time for a potty break Go on....leave this room Get your leash....means time for a walk I am sure that there are others too...but he is a selective listener, and only responds when it benefits him...LOL!Does your dog understand you when you talk?