I slid the letter into the envelope.
She posted her job application in a rose-scented envelope.
She ripped open the envelope, expecting to find money in the birthday card. She was thoroughly disappointed.
That is a rather thick envelope. The ship began to slowly disappear as the fog bank began to envelope it.
The postage stamp on the envelope was colorful.
The word its is a possessive form of the pronoun 'it', used as an attributive adjective.It is less awkward than saying 'Put the letter in the letter's envelope' or '... the envelope of the letter'.
Please send a self-addressed envelope to our office.
Sealing usually means, to be encasing something in an envelope or another object, so a good sentence would be:When sealing an envelope, make sure that it is pressed down firmly.
I opened the envelope that contained my check.
The envelope and its portentous contents fell onto the mat with a dull thud.
When an envelope is marked, "confidential", we're not authorized to open it; give it directly to the manager.
The Greek word for "Envelope" is "φάκελος".
I won't receive your letter if it is not postpaid. Please return your payment in the provided postpaid envelope.
The prepositional phrase in the sentence is "on the envelope".
It's "on the envelope" because it is showing place or time. Some key words are: -in -on -under -by -to