Everyone has an opinion. One way to express your opinion and get others to agree with it is to present an argumentative speech. In this kind of presentation, the speaker takes a stand on an issue and provides information demonstrating why his position is better than the opposing one. If you follow the standard format for a speech of this type, you can convince listeners of the validity of your position and lead others to agree with you.
Select a topic
Select a topic. Pick a topic that is arguable. Trying to argue that the sky is not blue or that the Earth is flat is ineffective, as these things are fact, not opinion. Whenever possible, select a topic that is relevant and current, as well as one that you truly care about. You will be more effective in arguing your position if you have an interest in the topic.
Decide which position you want to argue. Do not be wishy washy in your selection, but instead pick one position or the other. It is highly probable that both positions have merit, but to create an effective argumentative speech, you need to select one side and argue it thoroughly.
Study the topic
Study the topic. Even if you think that you are an expert on the topic, you must do your basic research. Look for evidence, especially statistics, that supports your position.
Write an attention-getting introduction
Write an attention-getting introduction. Your argument won't convince anyone if nobody is listening. Grab your listeners' attention with an engaging introduction. Quote statistics, site an expert or provide a surprising fact at the beginning of your speech to draw in your listeners.
Do not assume that your listeners
Do not assume that your listeners understand the topic. Spend some time explaining the topic clearly so that they understand it.
State your position clearly and quickly
State your position clearly and quickly, backing it up with supporting information that you gleaned during your research.
Conclude your speech
Conclude your speech with a restatement of the main points. Leave your listeners with no questions. Point out any particularly relevant points once more, reminding listeners a final time why your position is the right one.