A pattern envelope is the outside cover of a pattern. It is traditionally a paper envelope, but it can also be a clear plastic bag. The traditional paper envelope is printed with an image of the project to be made with the pattern, along with a complete list of all the materials needed to complete the project. Patterns enclosed in a clear plastic covering will have this same information printed on the pattern cover, which can be read through the plastic.
The answer is an envelope. It contains a letter.
Envelope is a noun.
It does
The word is "envelope" (which usually holds only one letter).
on the envelope.
This envelope is like the window envelope,but the window opening is uncovered (an uncovered address panel).
The prepositional phrase in the sentence is "on the envelope".
The possessive form for the noun envelope is envelope's.Example: The envelope's flap wasn't sealed.
When sending a wedding invitation the response card should go into the response envelope and you should address it back to you on the front of the response envelope with a stamp on the envelope.
Envelopes is correct.
I opened the envelope that contained my check.
When addressing a standard envelope, the correct location for the return address is the upper left corner of the envelope.