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.
Typically, large envelopes are sent in an envelope large enough to fit an unfolded 8Â½â x 11â sheet of paper. Envelopes used for flat mail cannot be more than Â¾â thick, 12â high, 15â long or weigh more than 13 ounces. The USPS considers any envelope bigger than this size to be a package, and will be subject to parcel prices.