F. Definition of Terms
This section describes all the key terms appear in this research. They are: 1. Teacher
A teacher is a person whose job is teaching. A teacher has a responsibility to the whole teaching learning process in the classroom.
2. Teacher’s introductory language or teacher’s talk The teacher’s introductory language which is known as teacher’s talk is
language used by the teacher in classroom to teach the students whose complexity varies according to the level of the learners. Language is for
communication. It means that the teacher’s introductory language is a tool to communicate between the teacher and students in the classroom. In addition,
according to Ellis 1985 teacher’s talk is a means to deliver the lesson and all kinds related to the learning to the students Therefore, the teacher needs to
adjust the language he uses to the students level. The teacher’s introductory language consists of all speeches of the teacher
which occur in the teaching and learning activities. In this research, the speeches refer to the explanations, questions, error corrections, and giving feedback to the
students. 3. Senior High School Students
Senior High School students are those young people between the ages of 15 and 18. They are included in the formal operational stage as proposed in the
cognitive development theory. They can be considered as independent learners but they still need comprehensible input from their teacher. However, according
to Harmer 2001, Senior High School students are adolescents who have learned secondary school and they are called as teenagers.
4. The role of teacher’s introductory language
There are many roles of the teacher’s introductory language in teaching English to Senior High School students. The role is to facilitate the teaching
learning activities. By teacher’s introductory language, the teacher can control the classroom and the teacher can create conducive classroom because the
teacher adjusts the talk on students’ proficiency level. The other roles as said by Nunan 1989 in Language Classroom, they are to organize the students and
classroom, assess the students using the target language, to provide the best source of the target language since the students meet the teacher every day, to
explain the materials to the students, to give questions, to correct students’ mistakes and to provide feedback to the students
CHAPTER II LITERATURE REVIEW
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