Subjects tell the listener and the reader whom or what the sentence is about. The subject is that part of a sentence which names a person, thing, or idea. e.g. Every complete subject contains a simple subject. The simple subject, which is a noun or pronoun, is the most important word in the complete subject.
The USPS considers a postcard to be any single rectangular piece of paper that is at least 3 1/2 inches high by 5 inches long by 0.007 inch thick' and no more than 4-1/4 inches high by 6 inches long by 0.016 inches thick.. The post office considers all papers outside of these dimensions to be letters.
Size & Weight Requirements. 1  Postcards Postcards must be rectangular to qualify for First-Class MailÂ® prices. 2  Oversized postcard will be charged as a letter or large envelope. 3  Size Requirements: Height: 3 1/2 min. / 4  4 1/4 max. 5  Length: 5 1/2 min.