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Table 11 Exchange 9': Elaborating phase as exchange

From: Analysing pedagogic discourse: an approach from genre and register

T What's it changing? dK1 class Focus
S2 state K2 S2 Propose
T state K1 S2 Affirm
OK
T What are the three states of matter? dK1 class Focus
S3 solid, liquid, gas, K2 S3 Propose
T That’s right. K1 S3 Affirm