onto infinitives, first-person present verbs, and 3rd person past perfect verbs. He can goes out. I don't know how to gets no girls. He'd knows that. Further examples of the phenomenon in AAVE are provided below. Below are examples of the lack of the possessive ending; -s is usually absent in AAVE but contains a rule As Labov states, "[the] use -s to indicate possession by a single noun or pronoun, but never between the possessor and the possessed." "This is hers, This is mines, This is John's, but not in her book, my book, John book" "Interview with Bryan A., seven years old, a struggling reader in a West Philadelphia elementary school: If I don't get out my mom room, I get in trouble and when I don't get out my sister room she hit me. Bernicia penpal gave me one. That's what he did to my cousin Raymond dog at my cousin house. I was acting like I stole my sister food. At the museum, it was fun, we went in somebody heart." Effects Code-switching Many times within communities that contain sociolects that separate groups linguistically it is necessary to have a process where the independent speech communities can communicate in the same register; even if the change is as simple as different pronunciation. Therefore, the act of code-switching becomes essential. Code-switching is defined as "the process whereby bilingual or bidialectal speakers switch back and forth between one language or dialect and another within the same conversation". At times code-switching can be situational, depending on the situation or topical, depending on the topic. Halliday terms this the best when he defines the role of discourse stating that "it is this that determines, or rather correlates with, the role played by the language activity in the situation". Therefore, meaning that which register is used depends on the situation and lays out the social context of the situation, because if the wrong register is used, then the wrong context is placed on the words. Furthermore, referring back to the diglossia expressed in the Arab-speaking world and the Tamil caste system in India, which words are used must be appropriate to not only the social class of the speaker, but the situation, the topic, and the need for courtesy. A more comprehensive definition is stated, "Code-switching is not only a definition of the situation but an expression of social hierarchy." See