Some Conventions Of Horror Trialers:

•  They highlight the 'best bits' of the film
•  We are not shown the story in narrative order
•  They showcase the stars of the film
•  Conversations between characters usually consist of one line each
•  Voice - Overs are used to tell the story and give credit information
•  Music plays an important role in creating atmosphere
•  The title does not appear until the end
•  The trailer builds to a climax, where it ends