You comes from the Proto-Germanicdemonstrative base *juz-, *iwwiz from Proto-Indo-European*yu- (second-person plural pronoun). Old English had singular, dual, and plural second-person pronouns. The dual form was lost by the 12th century,:117 and the singular form was lost by the early 1600s. The development is shown in the following table.:117,120,121
Second-person pronouns in Old, Middle and Modern English
Early Modern English distinguished between the plural ye and the singular thou. As in many other European languages, English at the time had a T–V distinction, which made the plural forms more respectful and deferential; they were used to address strangers and social superiors. This distinction ultimately led to familiar thou becoming obsolete in modern English, although it persists in some English dialects.
Yourself had developed by the early 14th century, with the plural yourselves attested from 1520.
Morphology
In Standard Modern English, you has five shapes representing six distinct word forms:
yourself: the singular reflexive and intensive (emphatic) form
Plural forms from other varieties
Although there is some dialectal retention of the original plural ye and the original singular thou, most English-speaking groups have lost the original forms. Because of the loss of the original singular-plural distinction, many English dialects belonging to this group have innovated new plural forms of the second person pronoun. Examples of such pronouns sometimes seen and heard include:
you guys – United States, particularly in the Midwest, Northeast, South Florida and West Coast; Canada, Australia. Gendered usage varies; for mixed groups, "you guys" is nearly always used. For groups consisting of only women, forms like "you girls" or "you gals" might appear instead, though "you guys" is sometimes used for a group of only women as well.
ye, yee,yees,yiz – Ireland, Tyneside, Newfoundland and Labrador
In the United States, "youse" may have an uneducated connotation for some listeners. This caused "you guys" to displace "youse" in many regions. In regions where "youse" is still used, it may be preferred for being gender neutral. Among Midwesterners, "youse guys" might be preferred for larger groups.
Semantics
You prototypically refers to the addressee along with zero or more other persons, excluding the speaker. You is also used to refer to personified things (e.g., why won't you start? addressed to a car). You is always definite even when it is not specific.
Semantically, you is both singular and plural, though syntactically it is almost always plural: i.e. always takes a verb form that originally marked the word as plural, (i.e. you are, in common with we are and they are).
First person usage
The practice of referring to oneself as you, occasionally known as tuism, is common when talking to oneself. It is less common in conversations with others, as it could easily result in confusion. Since English lacks a distinct first person singular imperative mood, you and let's function as substitutes.
↑Howe, Stephen (1996). The Personal Pronouns in the Germanic Languages: A Study of Personal Morphology and Change in the Germanic Languages from the First Records to the Present Day. p. 174. Walter de Gruyter & Co. ISBN978-3110146363
↑Gammage, Kimberley L; Hardy, James; Hall, Craig R (October 2001). "A description of self-talk in exercise". Psychology of Sport and Exercise. 2 (4): 233–247. doi:10.1016/S1469-0292(01)00011-5.
↑Dolcos, Sanda; Albarracin, Dolores (October 2014). "The inner speech of behavioral regulation: Intentions and task performance strengthen when you talk to yourself as a You: Self-talk person and self-regulation". European Journal of Social Psychology. 44 (6): 636–642. doi:10.1002/ejsp.2048.