We may ask why! But we must have to remember that nobody is perfect in this world and that all of us are telling lies. Telling lies is already part of our system and we seldom keep away from doing so.
By the way, will you consider telling “white lies” a mistake? A sin? For me, no matter what your reasons are, as long as you are telling lies, you've made a mistake! If you are telling a lie, it is the same as you are putting mud in your head. Telling lies is not justifiable because it will surely have outcome, a bad outcome, and that; the secret can't be hidden forever. The secret would sooner or later come out and you will just display a frown or a sarcastic smile in your face.
But how will we know if someone is not telling the truth? We all know that “lie detector test” will not give us zero percentage of error. And besides, it is so expensive! So, we must have to find other means on how to determine is someone is telling the truth or a lie?
Actually, there are many things that you must have to consider and you must have to be a keen observant to justify your judgment. The first determinant (symptom, per se) that someone is telling a lie is his physical expression or what we call as body language. It is indeed noticeable that if someone is telling a lie, there will be a change in the way he talks and the way he looks at you. It is also obvious is someone is telling a lie if he will feel uneasy, thus, having few arm and hand movements. So, you must have to observe for the first symptom.
You must have to be curious enough in determining the authenticity of the topic or words presented to you somebody. If you are not sure about what he said, try looking at him with the eye. We all know that liars avoid making eye contact because they are afraid that they will be discovered for being such a liar. So, if he really wants you to believe on what he is saying, have eye contact with him. If he does, good! If not, then, you better not believe him! But of course, don't make initial judgment! Make sure before making any move so as not to make another mistake…not on his part but yours.
The next thing that you must have to do is his emotional gestures which might be a big factor. If he/she is feeling unnatural or uncomfortable of what he/she is saying, then, he/she is proven a great pretender, a liar! Though other people exhibit excellent gesture when telling a lie, we cannot deny the fact that most of us can't perfect the craft. And so, if his/her gesture is totally different or opposite of what is suppose to be right, then move on and don't let yourself believe on them. This is to avoid further damage.
Another determinant that must be observed by you are interactions and reactions. What you have to do is to focus your attention on what they are saying/telling you, be conversational and presto! We all know that if a person is guilty, is not telling the truth, he will become defensive. On the contrary, if the person is telling the truth, he will become offensive and more conversational to you. If questioned, a guilty person/liar will feel uneasy and comfortable talking to you. As if he wanted to walk away from you so that you will stop asking questions to him.
Talking about the way a person talks, a liar could not clearly state his/her point. Sometimes, he/she will just murmur or will not clearly answer the question. As a result, you will have a hard time in analyzing what he/she are saying. An example of this is when you will ask somebody, “Did you drink the last apple in the refrigerator?” and he/she will answer, “No, I did not eat the last apple! In fact, there was still another apple when I got one!” The fact is this; he/she will not want that you will think that he/she is the one eating the last apple in the ref! Funny, right?
The last action to trace whether he/she is telling the truth or not, is to consider the flow of conversation and the way of transferring from one topic to another. If you think that a person is telling a lie, you can opt to change the topic of your conversation. This will make the liar at ease. When you are talking about another topic, he/she will be an active listener again. it is self-explanatory that whenever we are telling a lie, we want to have the topic changed. On the other hand, an innocent person wanted to stick to the previous topic and no matter how you would bring him/her to the new topic, he/she will still have time to make a segue and go back to the previous topic! So, watch out!
译文:
谎言是很明显的，但怎样知道是否别人在说谎？
我们可能会问为什么会这样！但是我们必须明白，在这个世界上人无完人，我们大多数人都撒过谎。撒谎已经成为我们的一部分了，我们很少能够避免撒谎。
顺便问一下，你认为撒谎或者撒一个善意的谎言是错误的吗？是一种罪过吗？对于我来说，无论你出于什么样的原因，只要你撒谎了，那你就犯了一个错！如果你撒了一个谎，就如同在你的头顶上涂了一层泥。说谎是不合理的，因为它会有后果，一个很坏的后果。秘密不可能永远得被隐藏起来。它终究会大白于天下，到那时你只能皱眉头或者苦笑了。
但是我们怎么知道个一个人是说实话还是在撒谎呢？我们都知道测谎仪也不能保证100%准确。此外，测谎仪很贵。所以我们必须寻找另外一些方法去鉴别别人是否说谎。
实际上，有很多事你必须思考，你必须细致地观察来证明你的判断。一个人说了谎，它的第一个征兆就是面部表情或者我们称之为肢体语言。很容易发现一个人是否说了谎，因为如果说了谎，他说话的方式和他看你的方式就会变化。如果一个人说了谎，他会感到不自在，或者出现一些小动作。所以，你必须观察这些说谎的第一征兆。
你应该对于一个话题和某个人对你的话的真实性抱有疑问。如果你不太肯定别人对你所说的，试着看着他的眼睛。我们都知道说谎者经常避免眼神的交流，因为他们害怕被看穿。所以，如果他真得想让你相信他所说的，和他做眼神交流。如果他肯和你眼神交流，那样最好，如果他不和你眼神交流，那么你最好不要相信他！但是也不要草率判定。在做任何决定之前，首先要十分肯定，以免别人没犯错你倒犯了。
接下来，你必须注意他的激动的姿势，那可能是一个很大的因素。如果他/她对于他/她所说的感觉不自然或则不舒服，他/她很可能在说谎。尽管有一些人撒了谎却掩饰得很好，但是我们不能否认这样一个事实，我们大多数不可能做到那样。所以，他/她的姿势和他/她本来应有的姿势完全不对头的话，离开后不要相信他们。这样可以避免日后的损失。
另一个你必须观察的决定因素是相互作用和反作用。你必须做的是集中你的注意力去听他们在对你说什么，你应该健谈，快速思考。我们知道如果一个人有负罪感或说谎，他就会变得很有防备性。相反，如果一个人在说实话，他就变得很有攻击性和更加健谈。如果你一质问，说谎者就会感觉不自在和不舒服。就好像他想从你身边逃走，那样你就不会在追问了。
一个人说话的方式，撒谎者不会清楚得陈述自己的观点。有时，他/她只是在低语或者不清楚地回答问题。结果，你很难分析他们在说什么。这儿有一个例子。当你问道：“你吃冰箱里那最后一个苹果吗？” 他/她将会回答：不，我不吃最后一个苹果！实际上，当我得到一个苹果的时候仍然会有另外一个苹果。事实是这样的，他/她不想让你认为他/她是吃冰箱里最后苹果的人。很可笑，对吗？
追踪他/她是否是说谎者的最后一招是看你们的谈话是否流畅和换话题的方法。如果你认为一个人在说谎，你可以选择换一个话题。这样就会让说谎者放松。当你在说另一个话题的时候，他/她又会变成一个积极的听众。显然，无论我们什么时候说谎，我们就想换话题。另一方面，一个诚实的人想继续前一个话题，无论你用什么方式使他/她进入一个新话题，他/她仍然有时间回到前一个话题！所以，当心一点！