This study examines how iconically designed teacher talk facilitates preschool novice L2 learners’ construction development through playful interactions. It combines two approaches: ethnomethodological conversation analysis and usage-based linguistics. The conversational data were retrieved from teacher-children interactions filmed at an all-English school in Japan. The microanalysis of 945-minute classroom interactions illustrated that when a part of teacher talk was packaged with iconic semiotic resources, such as gestures, situated meanings, tones of voice, and affective stances, it became accessible L2 resources for the children to learn and recycle in their subsequent utterances. Simultaneously, the analysis also revealed the pragmatic mechanism of teachers’ assignment of interactional responsibility, inviting children to perform language learning of target constructions through recyclings. The recycled part of the teacher talk indicated the children’s microgenetic usage-based language learning as they modified and developed L2 constructions to accomplish certain social actions—sanction of a deviated action, attention-getting, and storytelling in situ. This study indicates that language learning opportunities can be integrated into children’s processes of achieving specific social actions, and language learning performance can be invited as an appropriate practice in situ by certain teacher talk designs.