Linguistic Structure: Whether it is spoken, written or signed every language has its structure, it is governed by two things: rules and principles. Rules govern the pronunciation of sounds; the way how words are put together; the manner in which phrases, clauses, and sentences are structured; and ultimately, the ways the meaning is created. They are studied under the rubric of grammar. Principles, however, governs how the structure the rules create should be used; which forms will be polite in which contexts, which forms will not. They are studied under the province of pragmatics. Consider why a child came crying to his father uttering “I broked my toy” instead of saying breaked, it is necessary to investigate the linguistic rules that the child used to create this structure. Linguistic rules or descriptive rules are different from prescriptive rules (the unconscious knowledge that people possess). linguists would describe the rules of a language (descriptive), and pedagogues would use those descriptions to make textbooks to teach language learners what is so-called standard English (prescriptive). Even though the sentence the child uttered does not conform to the standard English; the past tense of break is broke, not broked, it provides evidence that the child is aware of the rules of grammar for past tenses, which is usually adding -ed to the end of the verb, but he has not reached a stage of acquisition where he is able to recognize the difference between regular and irregular verbs. Letters and sounds: Letters are written, and sounds are spoken. It is important that these functions are not confused. When we write in normal spelling, we are using letters to convey sounds. In English this relationship is only ever a rough guide to pronunciation, and it is certainly not reliable. In our alphabet, we have only five vowel letters: A, E, I, O, and U, this can be very inconvenient when we want to discuss sounds. The ideal solution could be to adopt a method of spelling that is completely consistent, where a reader would know that a certain symbol would always refer to the same sound. We will keep our use of technical symbols to a minimum. However, in cases where our alphabet is inadequate (as with the two the sounds, as in thin and then, or the sound at the end of sing) we will need to use phonemic symbols. Linguists have devised systems such as the International Phonetic Association’s Alphabet (IPA) to assign a unique and unambiguous symbol to each attested sound, either consonant or vowel. Consonants and vowels: Consonants: as opposed to vowels, in articulatory phonetics, a consonant is a speech sound that is articulated with complete or partial closure of the vocal tract. Examples are /p/, pronounced with the lips; /t/, pronounced with the front of the tongue; /k/, pronounced with the back of the tongue; /h/, pronounced in the throat; /f/ and /s/, pronounced by forcing air through a narrow channel (fricatives); and /m/ and /n/, which have air flowing through the nose (nasals). Since the number of possible sounds in all of the world's languages is much greater than the number of letters in any one alphabet, linguists have devised systems such as the International Phonetic Alphabet (IPA) to assign a unique and unambiguous symbol to each attested consonant. Vowels: etymologically, the word vowel derives from the Latin word vocalis, meaning "vocal"; relating to the voice. As opposed to consonants, in articulatory phonetics, a vowel is a sound produced with no constriction in the vocal tract. In the phonetic definition, a vowel is a sound, such as the English "ah" /ɑː/ or "oh" /oʊ/, produced with an open vocal tract; it is median (the air escapes along the middle of the tongue), oral (at least some of the airflow must escape through the mouth), frictionless and continuant. There is no significant build-up of air pressure at any point above the glottis. We can further describe the words in terms of CVC pattern, in which “C” stands for consonant and “V” for vowel. For example: the word “cat” its pattern is CVC. Another feature of a language like English is that some pronunciations correspond to multiple spellings. In homophones, which derives from the Greek “homo” the same and “phone” sound, means that words look different but are pronounced the same. Such as the words passed and past. In homographs, which is opposed to homophones, which means that the words look the same, but have different pronunciations. Such as the word minute and minute, they are spelled the same, but they have two different pronunciations. Place of Articulation: in articulatory phonetics, the place of articulation of a consonant is the point of contact where an obstruction occurs in the vocal tract between an articulatory gesture, an active articulator (typically some part of the tongue), and a passive location (typically some part of the roof of the mouth). Along with the manner of articulation and the phonation, it gives the consonant its distinctive sound. The way in which air is modulated in the mouth is by putting together an active and a passive articulator. For example, the tip of the tongue can be put against the alveolar ridge to produce sounds that are labeled alveolar.