How do you know he/she isthe one' or isnot' the one? um...
when you know you will always wonna be around them or always thinking of them
oh you will know alright.
You won't have to ask yourself that.
Common sense says that there is more than one person who is ideal for you. However, if you have to ask the question, I doubt your partner fits into that category.
You can tell it from your heart. It is the person who completes you. It could be someone who is close to you or another person who have the same likes as you. There's more to this and that all I can think of