Final answer:
The main difference between the three block-style business letter formats lies in the alignment and indentation of certain parts like the sender's address, date, closing, and paragraphs.
Step-by-step explanation:
The main difference between the three block-style business letter formats is the placement and alignment of text. Although each style maintains a level of formality, they arrange the sender's address, date, closing, and signature in different ways. The three common block styles are:
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- Full Block: The most commonly used format where all elements are left-justified.
- Modified Block: The date and closing are centered or aligned to the right, and all other text is left-justified.
- Semi-Block: Similar to Modified Block, but each paragraph is indented.
Regardless of the format chosen, the business letter should be single spaced with double spacing between paragraphs, use a formal font like Times New Roman or Arial, and include all essential parts such as the sender's address, recipient's address, salutation, body, and closing line.