In the dialog among the mother tongue talkers, overlap utterances are done in transition-relevance places (TRP). This appearance seems to appear as the result of some capability which makes the mental burden of the dialog by the mother tongue light. We examined the age to win this capability about the Japanese mother tongue talkers. Last year, it did an analysis to the 6 year-old nursery school children. As a result, it found that it was already won. This time, it analyzed the dialog of the 5 year-old kindergartner. A difference among individuals was seen among the nursery school children to the acquisition.
