“'I don’t know' ends every exchange”

'I don't know' is rarely a report on what a student knows. More often it is the quickest safe exit from an uncomfortable moment. Answering out loud risks being wrong in front of everyone. Saying the words risks nothing, and it ends the spotlight. Often the student has had no time to think before an answer was expected, so in that second the words are even true. None of this is laziness or defiance. The student is using a door the routine leaves open, and every accepted 'I don't know' confirms that the door works.

The pattern holds because it gives everyone relief. The student escapes the pressure, you escape a stalled exchange, and the lesson keeps moving. Pressing on can feel like picking on someone, so accepting the words feels like the kind thing to do. Changing the pattern means closing that door without punishing anyone for having used it, and the techniques below do it from two directions: some make an answer easier to produce, with real thinking time or a quiet rehearsal with a partner, and some change what happens after the words, so the exchange carries on and the student still finishes by answering.