【正文】
. No, it isn39。t. It39。s Peter39。s. Whose schoolbag is this? It39。s mine. Is this your schoolbag? Yes, it39。s mine. No, it isn39。t. It39。s Cathy39。s. activity book Whose activity book is this? It39。s mine. activity book Is this your activity book? Yes, it39。s mine. No, it isn39。t. I