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Your body language can communicate that you're interested in talking with him - or that you'd rather leave. Keep your body turned in his direction, and your arms uncrossed. Leaning slightly forward towards him will also let him know that you're interested in what he has to say. Avoid fidgeting. If you feel the need to fidget, shift your physical position once and commit to it. Instead of freaking out about not having something more to add to the conversation, shift your thoughts to a new topic. Do not worry about fidgeting or feeling uncomfortable. If you start thinking about it, you're likely to end up fidgeting more. If you seem rigid or uncomfortable, the guy might think that you feel that way because of something he is doing wrong. This anxiety will only cause him to struggle further with a conversation. Even if the guy in front of you is real eye candy, staring him down will make him feel hunted. Keep your eye gaze directed towards him, but periodically glance away for a couple of seconds. Eye contact is important, but knowing when and how to break it is important, too. Eye contact lets a guy know that he has your undivided attention. If you're scanning the room, he might get the idea that you're looking for a better opportunity. Rather than staring right into his eyes while you talk, catch his eye with your gaze, then look away, then back again. Nod while he's talking to let him know you agree with him, or that you can relate to what he's saying. Smiling is especially important because it can help him think you're enjoying what he has to say. This will give him confidence to continue talking. Smiling also makes you appear more approachable, and less intimidating. Do not be afraid to express emotion with your hands, too. Many people talk while gesturing with their hands. If this is normal behavior to you, then don't worry about trying to tone it down or stop it. Make sure your facial expression reflects the tone of the conversation. If the conversation becomes serious, grinning happily will make you seem detached from the conversation at best and sadistic at worst. Do not split your attention between the guy you're talking to and something elselike a text conversation with a friend, for instance. In order to get the guy to continue talking, you need to let him know that you're listening to everything he says. If you accidentally say something foolish or embarrassing, acknowledge the error and move on. Everyone says something awkward every now and then. If and when it happens, just laugh it off as best as possible. Guys are quick to appreciate a girl's sense of humor. If anything, seeing you mess up and laugh it off will relieve the guy's tension and let him know it's okay if the same happens to him. You can apologize for your slip-up if you feel the need to do so, but after apologizing, let it go. You might want to meet him again, but don't assume the feeling is mutual and begin planning your next date. As the conversation goes on, drop hints about how you would like to spend more time with him. If you drop enough, most guys will catch on before the talk ends completely and act accordingly. The best hint you can drop is simply saying, "I really enjoyed talking with you. I hope we can do this again sometime soon." If he doesn't ask you to get together again, give him your contact information. After all, he might change his mind. Silence is not always as bad as you might think. It's possible that he isn't interested, but it is also possible that his nerves are just getting the better of him. Cut him slack and try not to persecute him too severely for his silence. If a guy is intentionally making his answers short and he seems distracted, he probably is not interested. That doesn't mean there's anything wrong with you. He probably has other things happening in his life. If a guy seems cold and brief as he talks but his body language suggests that he wants to stick around you, he might just be using his coldness as a way to cover his own feelings of awkwardness. If the guy seems intimidated by you, take things slower and lay off on the flirting. If this is a guy you're interested in romantically, this piece of advice might seem counter-intuitive. By fixating on creating a romantic ambiance, though, you might make it harder on the guy to relax long enough to converse with you. Reduce romantic tension by cutting back on any verbal or non-verbal flirting you might be doing. Keep your words and actions restricted to those you might use for a male friend or male relative.

Summary:
Look comfortable. Break eye contact from time to time. Be expressive. Show interest and attention. Do not judge yourself. Avoid seeming too eager. Know what his silence might mean. Eliminate or reduce romantic tension.