Formal speeches are appropriate when:
* The audience expects it: This could be due to the occasion (like a graduation ceremony or a business conference), the speaker's position (a political leader or academic), or the topic (a serious issue like global warming).
* The message requires seriousness: Formal language can lend weight to important issues, convey respect, and establish credibility.
* The goal is to persuade or inform: Formal speeches can be effective in conveying complex information and persuasive arguments in a structured and clear manner.
Informal speeches are appropriate when:
* The audience expects it: A casual gathering, a friend's birthday party, or a team meeting might call for a more relaxed and conversational style.
* The message is lighthearted or humorous: Informal language can create a more engaging and relatable atmosphere, especially when the topic is entertaining or personal.
* The goal is to connect with the audience: Informal speeches can build rapport and foster a sense of shared experience, making the speaker seem more approachable and authentic.
The key is to consider the following factors:
* The occasion: What is the purpose of the speech? What is the tone and atmosphere of the event?
* The audience: Who are you speaking to? What are their expectations?
* The topic: Is the subject serious or lighthearted? Does it require a formal or informal approach?
* Your own style: What kind of speaker are you? Do you feel more comfortable with a formal or informal style?
Ultimately, the most effective speeches are those that are appropriate for the situation and resonate with the audience. There is no one-size-fits-all answer to the question of whether all public speeches should be formal. It is crucial to choose a style that aligns with the context and helps you achieve your speaking goals.