of  a  phrase  is  the  phrase’s  central  element;  any  other  words  or  phrases in  the phrase orient to it, either by modifying it or complementing it” 2010, p. 275.
As  it  has  been  classified  by  some  experts,  there  are  five  major  types  of phrase. Those  are: noun  phrase,  verb  phrase,  adjective  phrase,  prepositional
phrase  and  adverbial  phrase. As  the  head  of  the  phrase determines  the  phrase’s category Delahunty  Garvey, 2010, p. 275, it is clear that a phrase which head
is a noun is categorized as noun phrase Leech, 1994, p. 315 which is considered as  the  most  frequently occurring phrase.  A  group  of  words  which its  head  is
typically verb and it can consist of just the main verb is called verb phrase Leech, 1994, p. 396. Meanwhile, a group of words which head is adjective and it is used
to modify a noun or pronoun is called adjective phrase Mas’ud, 2005, p. 171. At last,  it  is  obvious  that  adverbial  phrase  is  a  phrase  which  head  is  adverb  and
prepositional phrase is a phrase which head is a preposition Delahunty  Garvey, 2010, p. 275.
2.1.2 Theory of Syntax
Syntax is a study of the structure of sentences, “uncovering the underlying principles or rules, for constructing well-formed sentences if a particular language”
McManis,  Stollenwerk  and  Zheng  Seng,  1987,  p. 153.  As  a  subdivision  of  the study  of  grammar,  not  only  concerning  with  the  ways in  which  words  can  be
combined  together  to  form  and  sentences, syntax is  also  concerned  with the interpretation of phrases and sentences Radford, 1997, p. 1. There are two types
of  rules  in studying  sentence  structures, those  are: 1  phrase  structure rules or
constituent structure rules and 2 transformational rules. Those rules present the knowledge of  how  constituents  of  phrases  or sentences are  put  together  and
categorized in a language McManis, Stollenwerk and Zheng Seng, 1987, p. 171. However this study is not going to discuss further about this rules since it is not
the focus of this study. Leaving the rules above, words in all human language can be grouped into a
relatively  small  number  of  classes  called  syntactic  categories,  in  which constituents  belong  to,  reflecting  a  variety  of  factors including  the  type  of
meaning  the  words  express,  the type  of  affixes  that  they  take,  and  the  type  of sentence structures in which they can occur O’Grady, Dobrovolsky,  Katamba,
1997,  p.  182.  The  table  2.1  below  will  provides  the  example  of  how O’Grady, Dobrovolsky, and Katamba classify words in syntactic categories.
Table 2.1 Syntactic Categories
Lexical Categories Examples
Noun N Verb V
Adjective A Preposition P
Adverb Adv Harry, boy, wheat, policy, moisture, bravery
arrive, discuss, melt, hear, remain, dislike good, tall, old, intelligent, beautiful, fond
to, in, on, near, at, by silently, slowly, quietly, quickly, now
Non-lexical Categories Examples
Determiner Det Degree word Deg
Qualifier Qual Auxiliary Aux
Conjunction Con the, a, this, these
too, so, very, more, quite always, perhaps, often, never, almost
will, can, may, must, should, could and, or, but
However, the fact that some items can belong to more than one category may be a potential source of confusion in the word classification.