Yes it is true, making your audience aware that the speech is about to stop is one of the most crucial components of a conclusion.
The single most crucial element of speech preparation and performance is knowing your audience. In order to understand your audience's attitudes, beliefs, and values, do a psychological analysis of them.
Signaling the end of the speech, returning to the attention-getter, encouraging audience participation, summarizing the important themes, and making a closing statement are all elements of a conclusion.
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