You are correct that when giving a speech, using the "going-to" future tense consistently can provide a more cohesive and natural flow to the presentation. Let me explain the differences between the "going-to" future and the "will" future and how they are used in speech.
- "Going-to" future: The "going-to" future is used to talk about planned or intended actions in the future. It expresses a sense of intention, prediction, or expectation that something will happen based on present evidence or plans. It is often used when we have some kind of present evidence or indication that the event is likely to occur.
Example: "Today, I'm going to talk about climate change. First, I'm going to discuss its impacts on the environment. Then, I'm going to explore possible solutions."
- "Will" future: The "will" future is used to talk about spontaneous decisions, promises, predictions, or offers that are not based on prior plans or evidence. It is more about expressing the speaker's willingness or assertion of what they will do, rather than something that has been pre-planned.
Example: "Today, I will talk about climate change. First, I'll talk about its impacts on the environment. Then, I'll explore possible solutions."
Using the "going-to" future throughout the speech provides a more consistent and natural structure. It suggests that the topics have been thoughtfully organized and planned in advance. However, using the "will" future in the second and third sentences isn't grammatically incorrect, but it might feel slightly less organized or prepared compared to the "going-to" future.
To summarize, while both tenses are grammatically valid, using the "going-to" future consistently throughout the speech can create a more coherent and structured impression. It gives the audience a clearer sense that the speaker has prepared and organized the topics they are about to discuss.