The most widely used business letter formats are full block and modified block. We have compiled these examples for your review, but no cover letter is perfect.The form cannot be filed electronically. In this tipsheet, you'll learn about key components and strategies that make the biggest difference when writing a cover letter for an employer. Expand All Collapse All. The PDF version of these forms are FILLABLE. They can be filled out electronically, then printed. In modified block format, the date, closing, and signature are centered, while the rest of the letter is left-justified. When you are finished, you can print your completed form. Intheblanks form authorizing a filing agent to efile documents on behalf of an individual attorney.