Opening and closing of an oral presentation.

The main thing to start and end an oral presentation is to be formal, without colloquial expressions.

One important thing in an oral presentation is the opening and the ending, because there is when you catch the attention of the audience.

You can begin by highlighting the topics of which are to speak, inviting the public to take an interest in it, but make it more enjoyable without breaking the formality of the presentation.

To finish and close the presentation, you can invite the public to ask some questions about the presentation or some questions that are left ... A brief conclusion of the topic and finally thank the audience for listening to the presentation and have interested in it.