The structure for a speech is OREO.
The O stands for Opinion, an opinion is what somebody thinks of something. For example: the ocean is dying.
R stands for reasons, and E stands for explination. An example is: The ocean is dying by pollution, caused by plastic waste, and rubbish.
The last O stands for opinion, this is the over all opinion of the problem. For example: I think that we need to stop ocean pollution becuase it is killing ocean life.
OREO is the structure of a speech, O is opinion, R is reasons, E is explination and O is opinion.