Epistemic modality and hedging

The two boys use hedging and epistemic modal forms to soften the force of their propositions in the discussion (eg. B3: 'maybe', line 1, 'probably' line 9, 'I think' line 15, 'could' line 17; B4: 'I think' line 1), and thus are acting co-operatively in this aspect of their talk.

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