<P> The following is the general format, excluding indentation used in various formats: </P> <P> Business letters conform to generally one of six indentation formats: standard, open, block, semi-block, modified block, and modified semi-block . Put simply, "semi -" means that the first lines of paragraphs are indented; "modified" means that the sender's address, date, and closing are significantly indented . </P> <P> The standard - format letter uses a colon after the salutation and a comma after the complimentary closing . </P> <P> The open - format letter does not use punctuation after the salutation and no punctuation after the complimentary closing . </P>

Distinguish between complete block and modified block format