Why should students repeat?
Foreign language students need good clear models and many opportunities to practice.
Before students repeat
the teacher should
model the language.
The first steps towards fluency include repeating after the teacher's model.  Since the only opportunity that foreign language students have to practice their English is in the classroom,repetition is important.
Focus Attention - Repetition helps focus attention of the class on what the teacher or a student is doing.
Control of Class - A quick repetition focuses the students on the language item and brings the class together.
Total Participation - It's one time when everyone in the class is participating.
Shy/timid/hesitant students - It helps them take their first language steps.
Practice recognition of micro-skills in both a total and isolated context.
Pronunciation/articulation (pig/big - though/dough)
Word stress (dis
may, confusion)
Phrase stress (at seven o'clock vs. at
seven o'clocl)
Emphasis (I said
Induce not Deduce)
Rhythm
Pitch/intonation
Juncture: Did he see Mill? vs. Did he seem ill?
Introduction of new material
Error correction
WARNING! - Repetition can be overused: use it but don't abuse it.
More about Modeling
The teacher should model (with or without repetition) whenever necessary.
WHY?
1.  It allows the students to hear good examples.
2.  It encourages timid, shy, and underperforming students to participate by providing them with a crutch.
3.  It helps advanced speakers compare their language with the teacher's language and helps them refine their language.
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