The document analyzes the conventions followed in three radio advertisements from YouTube:
1) A Nando's ad uses a Portuguese accent to match the restaurant's theme and informal tone. It aims to entertain listeners and reflect the fast-paced service.
2) A Twinings ad targets adult/elderly tea drinkers with complex vocabulary and a formal RP accent, portraying a sophisticated British brand.
3) A Smart car ad immediately grabs attention with sports car mentions in a clear, formal accent to be taken seriously, with an informative yet fast-paced tone to encourage test drives.