usually like when you guys cheat on each other or dont talk much to each other or dont say i love you to each other. or yeah!
You know when french onion dip has gone bad because it has water on the top.
when it does not work
A relationship: when all the pleasure has totally gone out of it. Your life: NEVER. When you feel bad more than you feel good. When you have to stifle your personality to avoid an argument.
you know when you are not cotrolling the car.
check it
If you eat it and then throw up. ;)
If it's bad and you know it, why work on it?
If it is stale and a very light brown and nothing grows on top of it, then you know you have bad soil.
It as a dark color and it emits a bad order that is easily recognizable
It will probably smell bad or have a noticeably weird flavour to it.
Swap it with one you know is good.
Well it all depends if the sound of the engine is abnormal or muffled then it prolly gone bad and if it dont start then well you know its bad