When you are writing, you may find that you need to modify the argument structure to reach the audience in a more effective way. Once you have an introduction and a conclusion, you can combine and move any of the other parts around to suit your audience and purpose. You do not need to follow the same argument structure all the time.
Here is an example on how you can structure an argument assignment:
Write the introduction and state your point of view
We understand that audiences take in new information differently and come to understand and accept new points of view. Your argument can reflect this. Readers usually start with a state of ease and comfort with their own understanding and perspective. As you introduce new information and question their beliefs and understanding, your readers may enter a state of discomfort. At this point, the writer can help the audience assimilate new information and perspectives by providing clear evidence and relevant examples that build on what they already know.