There are many stories about the origin of this holiday. The following is one of them. In the third century, the Roman Emperor Claudius forbade young men to marry, as then they didn’t want to join his army. A priest named Valentine secretly married young people. One night he was caught and thrown in prison. His punishment was death. On that day, February 14, he left a little note for the daughter of the prison guard, who had become his friend. He signed it: ‘Love from your Valentine’. Today, people celebrate Valentine’s Day in many ways. They send cards, sweets or flowers to someone they love. Children usually decorate their classrooms with red paper hearts. They put all the greetings cards into one box and then distribute them. Sometimes it is difficult to guess who the sender is, as the cards usually say ‘Be my Valentine’ and are not signed.
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Глагол to be в конструкции to be + инфинитив употребляется в качестве глагола-связки и модального глагола для сообщения инструкции, для выражения заранее запланированного действия, для выражения возможности совершения действия и так далее.