2 One  can  analyze  a  text  through  systemic  functional  linguistics  as  the
theoretical  frameworks. A text typically  has three meanings, namely:  ideational, interpersonal, and textual, which represents how the speaker makes meaning in its
utterances.  As  a  persuasive  text,  sales  letter  carries  distinctive  interpersonal meaning,  which  relates  to the  social  relationship  between  the sales  letter  writer
and the potential customers. On the other hand, sales letter owns a lot of spoken text features although it has a written form. Thus, the writer is also encouraged to
observe the interpersonal meaning and type of language contained in a sales letter. Since there have already been plenty research projects that address mood-
residue structure and other type of metafunction, the writer decides to conduct a research  project  regarding  to  interpersonal  meaning  in  sales  letter  as  a  different
research object. The writer limits her focus on the typical mood types being used, social relationship between participants, and text type of sales letter. The research
is intended to complete the other research projects which only focused on mood and residue structures.
1.2. Research Problem
There are several research problems conducted in the research as follows: 1 What kind of structure do sales letters have?
2 What  is the social relationship between the speaker and the hearer  in a sales letter?
3 What kind of text is a sales letter?
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1.3. Purpose of the Study
There  are  several  purposes  conducted  in  the  research  to  answer  the  problems stated as follows.
1 identifying the mood types used and their functions in the sales letters. 2 discovering the role and social relationship between the sales letter writers and
the prospective buyers. 3 determining whether a sales letter is a spoken or written text.
1.4. Previous Studies
The  study  of  lexicogrammar  has  been  developed  as  an  analysis  instrument  in discussions about discourse time by time.
In order to come up with an appropriate research topic which has not been done before, the writer is obliged to examine
the previous works. Therefore, the writer compiles the following previous studies which utilize Hallidays Systemic Functional Grammar approach.
Septiana 2009 focused on identifying mood elements in the film script of Harry Potter and The Chamber of Secrets. She uses MOOD system in analyzing
the  data.  It  later  shows  that there  are  declarative,  interrogative,  imperative,  and exclamative  moods  existing  in  the  script,  with  declaratives  being  the  dominant
ones and exclamatives being the rare ones. Susanti  2007  explores  the  mood-residue  structure  in  Eugene  ONeills
Thirst play script and figures that declaratives dominate the text. She also suggests
4 that there are various kinds of structure for Residue. Meanwhile, Ermawati 2008
analyzes  mood-residue  structure  in  Nick  McIvers  novelette  and  finds  that declarative  mood  dominates  the  text.  No  exclamative  is  found  in  the  text.
Unfortunately, how the dominant patterns affect the texts is not explained in the research projects given above.
On the other hand, Narolita 2012 conducts a study of genre on company profiles. She discovers that company profile has linguistic features dominated by
specific  participants,  classifiers,  and  specific  deixis  in  nominal  groups.  Material processes and simple present tenses also dominate the observed clauses. She also
figures  that  a  company  profile  has  two  main  linguistic  structures,  which  are identification  and  description.  It  has  social  function  of  describing  the  company
being represented from its general stuffs to the specific ones. Continuing on, Dewi Indah  2013  attempts  to  analyze  the  genre  of  This  Odd  World  column  in  The
Jakarta  Post  newspaper.  She  combines  genre  analysis  and  transitivity  system  to find the significant features of the articles published in the column. The result is
that there are five kinds of text genre found in the articles: spoof text, recount text, news item text, anecdote text and narrative text. Both research projects show the
overall structure of the analyzed texts and their functions. Considering  the  strengths  and  weaknesses  of  the  previous  studies,  the
writer  conducts  a  research  through  analyzing  dominant  mood  type,  social relationship between interactants and text type of sales letter. The writer attempts
to provide a comprehensive illustration about the interpersonal meaning of sales letter.
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1.5. Organization of the Writing