Depending on their temperament, people with more or less inner anguish express their feelings for each other. The perception of such revelations is also very individual. However, there is a common language built on simplicity and sincerity that will help tell a boy or girl about sympathy.
Look for an excuse to meet or strike up a conversation, depending on the situation. If you met a boy at an exhibition, festival, film premiere, start from this "informational occasion". When approaching the object of sympathy, do not address him with a statement - no matter what its content will be. Such a remark can go nowhere, remain unanswered. Better to ask the guy a question about the event taking place. Start with a closed-ended question, that is, one that can be answered in monosyllables, definitely ("yes / no"). After securing the attention of the interlocutor, move on to the second remark. This time, nudge him into expanded reflections in the answer. If you are unsure of your improvisational skills, come up with questions in advance - the day before the event or at least a minute before the "attack". If the situation is such that there is nothing to discuss, ask your counterpart for help. Let it not be too difficult a favor - do not force him to move furniture. But the request should not seem like a trifle, so that the boy understands that you cannot cope without him. Perhaps you see this guy almost every day - at school or in a general company. To win him over and set the stage for a closer relationship, be open and friendly. Just do not make an effort for this, otherwise you risk crossing the line and sliding into excessive positivity and unmotivated delight. This attitude should not be directed only at the guy. Create a holistic, light image by participating in community parties, engaging in discussions, and supporting fun initiatives. In a conversation, express your opinion, listen carefully to his remarks and respond to them - but only if you really have something to say. As a last resort, just approve of his statement and sincerely praise. When addressing the boy, call him by his name - this puts the interlocutor on a subconscious level. When your relationship becomes close enough (in a friendly way), contact him through objects - ask him to convey something, touch the back of the chair on which he is sitting, etc. Also, do not exclude tactile contact with him - touch the shoulder when asking a question, etc. Make sure that such actions are not an invasion of the boy's personal space and do not look deliberate. If you communicate in a good, friendly company, you will talk about the boy as an extremely nice, intelligent and pleasant person when he is not around. Mutual friends will likely hint to him later that you care for him, and after making sure the soil is set, just tell him that you like him. This phrase, pronounced sincerely, even with excitement, will certainly be pleasant to him and will become the reason for rapprochement that you both need so much.