Anne and henry have been dating for about six weeks and have gradually become closer. they want to spend more time with each other, so they've decided to start dating exclusively. this interpersonal relationship is [personal-social or professional functional] based on knapp's model, anne and henry's relationship is in the stage [experimenting, initiating, intensifying, integrating, or bonding]

This interpersonal relationship Anne and Henry have is Personal-Social, in which the individual evaluates himself and the person with whom interacts.

Anne and Henry currently are in the intensifying stage of the relationship, based on Knapp's model. in which the interpersonal relationship begins to develop and the expression of feeling becomes more common.

They previously performed the initiating and experimenting phases, which represent the following acts:  they already smiled, made eye contact. they experimented shaking hands and body language, bought a drink to share. they already called on the phone or visited each other. they already ate a meal together. they have gone on a date.

in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )

both the address and the poster use diction to convey their message. diction is defined as a style of writing or speaking based on the types of words chosen in order to send a message. parallelism is when a similar sentence structure is used for several sentences on a text; roosevelt's address doesn't follow that. repetition has to do with repeating a word or sentence in order to emphasize and idea, however neither the poster nor the address use repetion. finally, the address doesn't use images to convey a message.