A. These patterns identify the adverts as part of the text type advertisements. The patterns are regular and recurrent within this text type. The use of these patterns raises the expectation that a text belongs to a particular text type, here advertisements.
B. In newspaper adverts, every printed line must be paid for. Using abbreviations shortens adverts so that they become less wordy and therefore also cost less.
C. The adverts fulfil very different purposes. Blandly speaking, job adverts tell their readers what employers ask for in a future employee, real estate adverts tell their readers what they get when buying the flats. The latter are used to attract the reader’s attention and interest so that they might eventually buy the flat. The function of the former is to find a suitable member of staff. > The intention of their authors differ.