format business letter is a little less formal than the block format letter and slightly more formal than the modified block format letter. It works well in almost all situations and is a good choice if you find yourself on the fence about which format to use.
Semi-block business letters differ from most others in that the first line of each paragraph is indented.
The followings are the characteristics of a Semi-Block Style / Format :
1. All text is aligned to the left margin, except the date, attention line, and complimentary close.
2. Paragraphs are indented.
3. paragraphs are separated by double or triple spacing.
This semi-block business letter format looks very much like the block letter format.Semi-block format letters are just a little more formal than modified semi-block business letters.