This title references the old grammar, the grammar that arose before a few French intellectuals (Derrida, Foucault, et al) advised us that grammar practices are mostly arbitrary and don't matter because what the speaker/writer is articulating is basically and mostly up for grabs anyway. And this will not be a spleen venting about how accurate and acceptable punctuation and spelling usage matter because they have to do with the acknowledged acceptance of their semiology within any particular English speaking culture. In any case, this has more to do with oral communication than written. And so to the point.
Traditional grammar asserts that English sentences express three fundamental attitudes: declarative, imperative and interrogative. (Some of you older than 50 will be nodding at this point.) The declarative sentence expresses a thought with no particular intent other than that implied through its choice of words. In oral verbal communication, the speaker generally utters this with no special inflection (not including radio and TV announcers who spin simple thoughts with great drama). Such a thought might be: "The package will be in the foyer."
The imperative or command form expresses urgency or necessity and generally omits the subject of the verb. The end punctuation can be a period or an exclamation point, depending on the context of the urgency or necessity. Such a thought will usually be expressed with an increase in volume and a precise articulation of each word (or in some cases each syllable). Such a thought might be: "Get the package in the foyer."
And then we have the interrogative, the form used to ask a question. The sentence structure is rearranged so that the subject is placed in the middle (usually) of the verb. The intent, both in structure and in tone and inflection, indicate a request for something, commonly a bit of information. The important thing to note is that the final word is vocalized with an upward tilt to the voice, signifying the interrogative. Such a thought might be: "Did you see the package in the foyer?" Now, when you read that, you could "hear" the upward tilt of the vocalization. That is emphasized with the punctuation mark. Even without the punctuation mark one would "hear" that.
OK. Now to the point of all this. Somewhere within the evolution of American English speakers a quaint conversion began to emerge. I'm calling it the interrogatively declarative. This is the vocalized expression of a declarative construction that ends with an interrogative inflection. Such a thought looks like this in print: "The package will be in the foyer? I'm not actually sure?" I'm either too lazy or insufficiently provoked to delve into how and why this has occurred (or both), but I have some ideas about it.
I first noticed it mostly among young female speakers (males seem recently to have adopted it, but mostly, and interestingly, only when speaking with females). This led me to a combination of psychological and social speculations. Perhaps the speakers are uncertain of the ability of their audience to comprehend their meaning in the declarative and so inflect the declarative interrogatively to be asking "Do you understand?" Or perhaps the speakers are uncertain of their ability to communicate with this audience and are inflecting the declarative by asking "Do you understand me?"
I would be shocked if some feminist linguists had not combed through this phenomenon. Such a theory might involve a survey of the psychological forces behind phallo-centric language structures and/or the implicit uncertainty some females have regarding their stature in certain social contexts (on the job, at school, etc.). I don't know the reason. But I do know the phenomenon exists. In fact, I would go so far as to say it is generational. It doesn't seem to exist among females 40 years old and older. In addition, as a male, I react to it with a sense that the speaker (male or female, by the way) lacks a certain degree of self-confidence that he or she might not otherwise be expressing. Of course, that's only my reaction.
So much is revealed about our unconscious selves in how we present our thoughts to others. You know, like in blog posts.