Usually... :) If you are close to the person then you would be able to tell right away if he/she is lying to you. But I guess it depends on the person. If you are too trusting and fail to make an observation ofm your surroundings then there's a big chance that you would be played for a fool by a great deal of people.
As for me, I am not really trusting by nature. Oh, I see the good in everyone but that doesn't mean that you could feed me anything and expect me to accept it as is. I always take into account the way a person construct his/her arguments. I make sure that I see no contradictions on his/her statements. Watch out for their reactions too. Remain calm even if you feel that he/she is lying his/her teeth out. This way, you would be better able to expose his/her scheme.
Ask a lot of questions and make sure that they answer them accordingly. Truyst your instinct. :) Be skeptic (but not so much). :) Use the power of deduction.... :)
You should never have to lie to anyone...
A person paid to lie will hesitate in starting. They cannot answer you as fluently as a true person.
It makes you feel foolish (if you believed the lie), mad (that someone would even lie to you) or happy (that someone would lie to you to not hurt your feelings). It depends on the situation.
There are many reasons why someone might lie. To get out of trouble, to avoid something unpleasant (such as an outing with someone you don't like) or to make themselves sound impressive (also called bragging.) A lie can also be told to keep someone's feelings from being hurt. A lie that is seemingly unimportant and carries little weight is know as a "white lie". In extreme situations, someone might tell a lie to save their life.
Sometimes people lie to not hurt someone's feelings.
You should never lie to make someone feel better, all they want is the truth!
What usually happens when someone tells a lie is rumors are started. You get into a fight or you lose the trust of someone you love and care about.
Just be honest!
Slander
It means to lie to someone.
撒谎 (Sā huǎng) is "to lie to someone". 躺 (Tǎng) is "to lie down".
It is not necessarily good to lie. Eventually you will have to tell the truth or it will come out. Sometimes you lie to spare someone else's feelings. Or you can lie to cover up something bad that you did.