Go through the power-point and each persuasive device. Understand that all these tools won't necessarily be in one advert but some will be used to make their target audience want to buy it!
Here are examples of the rule of three;
homework- Concentrate, listen and work hard!
crisps- Crunchy, tasty and crisp!
clowns- Cheerful, colourful and energetic!
Or choose your own object.
Alliteration- The snakes, slithers across the slimy swamp.
Repetition- The highway man kept riding, riding, riding.