Well, it kind of depends what you're advertising for. Here are some of the ones that came up to the top of my head when I thought "commercial".
"Buy now!"
"Parts sold separately."
"Vote ______!"
"_______ is not responsible for any tragedies."
"Consult with your doctor before taking ________."
"*name of the product, and then catchy slogan*"
When writing a formal speech
A message or insight recognized in many cultures is a universal theme.
Answer:
The main idea is the point of the paragraph. It's usually a sentence, it is usually the the first sentence. But yeah that's all I know. I hope I helped at least ._.
