I went down to the post office to deliver my envolope.
That is a rather thick envelope. The ship began to slowly disappear as the fog bank began to envelope it.
The attorney is carrying a large manila envelope.
I opened the envelope that contained my check.
My private letter to a loved one was sealed in an envelope and posted.
Please send a self-addressed envelope to our office.
According to the postmark, the envelope originated Salem, Oregon.
I can give you several sentences.I mailed the envelope with the check inside.The earth is surrounded by an envelope of air.We need a larger envelope for this report.
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.
The prepositional phrase in the sentence is "on the envelope".
The envelope and its portentous contents fell onto the mat with a dull thud.
After you finish writing a letter, put it in an envelope so it can be sent off to someone.
It's "on the envelope" because it is showing place or time. Some key words are: -in -on -under -by -to