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49. The head-first-head last approach to the phrase structure.

In linguistics, the head of a phrase is the word that determines the syntactic type of that phrase or analogously the stem that determines the semantic category of a compound of which it is a part. The other elements modify the head and are therefore the head's dependents. Headed phrases and compounds are endocentric, whereas exocentric ("headless") phrases and compounds (if they exist) lack a clear head. Heads are crucial to establishing the direction of branching. Head-initial phrases are right- branching, head-final phrases are left-branching, and head-medial phrases combine left- and right-branching.

50. Marked and unmarked forms of English grammar.

In many areas of language study, a relationship between linguistic elements in which one element is more distinctively marked than another unmarked element. As Geoffrey Leech observes, "Where there is a contrast between two or more members of a category such as number, case, or tense, one of them is called 'marked' if it contains some extra affix, as opposed to the 'unmarked' member which does not" (see below). The terms marked and unmarked were introduced by Nikolai Trubetzkoy in his 1931 article on "Die phonologischen Systeme." However, Trubetzkoy's conception of markedness applied exclusively to phonology. The unmarked form is the 'ordinary' or 'basic' form, while the marked form differs from the first in containing extra material or in being confined to special contexts. For example, cat is unmarked, while its plural cats is marked by the suffix -s. Likewise, lion is unmarked, while the female lioness is marked by the suffix -ess, and consistent is unmarked in comparison with its negative inconsistent. The active sentence The police arrested Susie is unmarked with respect to its passive counterpart Susie was arrested by the police, which contains more material.

51. The system of polarity: support the theory with examples.

Polarity in international relations is any of the various ways in which power[vague] is distributed within the international system[vague]. It describes the nature of the international system at any given period of time. One generally distinguishes four types of systems: Unipolarity, Bipolarity, Tripolarity, and Multipolarity, for four or more centers of power. The type of system is completely dependent on the distribution of power and influence of states in a region or internationally.

xamples of unipolarity

The most recent example of a unipolar world has been one dominated by the United States of America since 1991, in the aftermath of the collapse of the Soviet Union. Other states and empires in the past have dominated their known worlds in a unipolar fashion. Some examples are below. Note that most of the cases as well as the dates given are open to some debate.

The Egyptian Empire from c. 3150 BCE to c. 1285 BCE with some long breaks - from the unification of Upper and Lower Egypt to the conflict with the Hittites.

The Akkadian Empire from c. 2279 BCE to c. 2193 BCE.

The Assyrian Empire from 675 BCE to 626 BCE - from the invasion of Egypt to the revolt of Babylon.

The Persian Empire from 539 BCE to 449 BCE - from the conquest of Babylon to the Peace of Callias at latest.

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