How can you tell if someone is suicidal?

as a person who has expeirienced the feeling,

Usually they like to be alone and spend all there time listening to depressing music and are quite snappy...try not to confront! or they will do something stupid,

just do things that usually make them happy!

don't get angry when they (at first) seem to throw it back in your face...there only depressed,

time heals all! x