[header] How to make everyone think you're posh (teens ) [title] Speak correctly. [step] Listen to how people speak in your area and see if you can detect a " posh accent. " if so, try to imitate it. 
Avoid contractions-for example, say " you will " instead of " you'll. " use elongated vowel sounds, and avoid swearing; it shows a lack of manners and wrong conduct.