"envelop "versus "envelope"

Monday, February 15, 2016
 May I let you know that the word "envelop" is a verb and the nominal(noun) form of it is "envelope". As a verb, "envelop" means "to cover or wrap something/something completely". As a noun, "envelope" is that object often used for sending letters". e.g. They decided to envelop the letters before sending them (not "envelope"). The envelope has torn and we can no longer use it (not "envelop"). There is something else quite crucial that I would like to teach about these two. Let's continue tomorrow.
 Thanks.