how do you REALLY know if your lucid dreaming

This is probably the most common question that crosses peoples mind in regard to the matter.Well from my own experience, the benchmark factor is ,this ,in the dream you are experiencing,are you thinking generally as you would ,in ordinary waking life. ie. wondering where you are, what country ,town , or place this is. To give an example,a recent dream I had ,I was wandering around some town or city,I wanted to find out where I was, so I approached another entity in the dream,and asked where I was,at the same time going through my mind was the thought, "I bet I dont get a straight answer", the important thing here is I was thinking the same as I do in waking life. Incidentaly ,although I was told where I was,I could,nt make out just what was said, how frustrating.