请修缮这段文字要求表达要清晰语法要准确。Expressive speech act is a kind of psychological state that the speaker expresses to a certain content The common verbs of expressive speech act are thank congratulate apologize we

Expressive speech acts refer to the psychological state that a speaker expresses towards a particular content. Common verbs used in expressive speech acts include thanking, congratulating, apologizing, welcoming, and others. To ensure the authenticity of a public service announcement, the speaker must genuinely feel and express their emotions from the heart, allowing the audience to perceive the sincerity of their message.