The language used in speeches changes based on the

Questions
Time
Audience
Patterns

of the speech and the intended purpose.

Speeches delivered at different times may be more formal or informal depending on the occasion. For example, a speech delivered at a formal event such as a graduation ceremony may use more formal language compared to a speech delivered at a casual gathering.

The audience of a speech also determines the language used. A speech delivered to a group of professionals may use more technical language and jargon, while a speech delivered to a general audience may use simpler language and avoid complex terminology.

The patterns and structures of a speech also influence the language used. For example, a speech that follows a persuasive format may use rhetorical devices and emotional language to sway the audience, while a speech that is purely informative may use more straightforward language to convey information.

Overall, the language used in speeches is carefully chosen to effectively communicate the message to the audience and achieve the desired impact.