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2.5.1   The Functions of Teacher Talk
Teacher  talk  TT  is  the  language  produced  by  teachers  addressed  to learners  in  the  course  of  classroom  interaction.  It  serves  at  least  two  functions:
pedagogical and communicative. As for the pedagogical function, TT is produced by teachers with the intention that learners will take it as a model by which they
learn  the  language.  Besides,  it  can  also  help  them  perceive  and  analyze  the linguistic content of the speech, e.g. falling intonation showing the completion of
a  linguistic  unit,  superlative  degree  of  comparison  must  be  preceded  by  definite article “the”, and so forth.
To  serve  the  purpose  of  teaching  a  language,  teachers  as  facilitators  are usually  very  helpful  to  the  learners.  They  provide  them  material  assistance  and
mental support. First of all, teachers give sufficient input as a model to imitate and acquire.  That  is  manifested  in  the  form  of  the  use  of  modeling.  Then,  when  the
learners begin to reproduce, and are engaged in the process of hypothesis testing Faerch    Kasper,  1983:257,  teachers  provide  them  with  reinforcement  to
confirm or  feedback to reject their  hypothesis. That is  manifested  in the  form of using feedback. Hence, modeling and feedback seem to characterize the teacher‟s
speech. For  communicative  purposes,  on  the  other  hand,  TT  is  produced  to
establish  and  maintain  the  social  relationship  between  teachers  and  learners.  It might be used to draw and focus learners‟ attention, or to stimulate their responses
towards a certain message, etc.
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TT  is  used  for  pedagogical  purposes,  the  focus  is  to teach  the  learners  a language.  When  it  is  used  for  communicative  purposes,  the  focus  is  on  the
establishment of social and psychological to enliven the classroom interaction. To prepare  a  conductive  situation  in  which  instructional  process  becomes  effective.
For any purposes TT is produced, anyway, it can promote and encourage language acquisition as far as it is meaningful and comprehensible.
To  achieve  comprehensibility,  furthermore,  TT  is  usually  modified  and simplified to adjust to the current level of the learners‟ linguistic  and conceptual
capacity.  Linguistic  adjustments  can  be  either  formal  or  interactional;  whereas conceptual adjustment is usually made by preserving the familiarity of topics and
limiting the scope of the course contents.
2.5.2   Formal Modifications of Teacher Talk