Listen to the speech of the interlocutor. If he is trying to deceive you, then respond with a slight delay, inconsistent and rushed. Between words and expression of emotion can take time. In order to understand the interlocutor is lying to you or not, change the subject. If you are a liar, he is happy to change the subject. A liar can also give voice. When people worry, the timbre of his voice increases, and the pace slows.
A person can learn to wield your face, but the expression of the eyes change very difficult. If you doubt the honesty of the conversation, pay attention to the eyes. They can give the true mood and the intent. Besides, if he is, he will avoid your eyes.
Pay attention to gestures. When the man tries to hide the truth, trying to occupy as little space as possible in space. He pressed his feet, as shrivels and clamped. Trying to dissociate itself from an unpleasant conversation, he suddenly hands and feet, often touching the face. His gestures and indiscriminate cutting. Anxiety can be expressed in a busy walking around the room or a nervous shaking of the leg.
The phrasing, too, can tell much. If man is protected, confused in indications, it is likely that he is lying. Also he may use your words, repeat them to make the answer similar to your question. The answer may be blurry built so that it can be differently interpreted. Most people get confused in grammar and syntax. Listen and if you are a liar, you will notice inconsistencies in the conversation.
If the person speaks at length, decorating speech with epithets and introducing additional details, we can conclude that he is dishonest. In order to circumvent the embarrassing moment, people can use humor to distract you from the topic.