I presume that you are preparing for AISSCE , English(core). Formal letter. 1. Sender's Address. 2. Date. 3. Address of the. Find and save ideas about Letter writing format on Pinterest. | See more about Parts of the letter, Resume writing format and Job resume format. Block format is generally perceived as the most formal format. If you are writing your letter as an email, use block format, regardless of formality. Omit the.