Actividades de la niñez A list of activities, all in the yo form of the imperfect tense (I used to...), from your childhood. Tools See a list of terms used in these activities. Matching Flashcards (Java / non-Java) Concentration Word Search Activities created by: don Carlos Holman This activity was created by a Quia Web subscriber. To learn how to make your own, just like this, click here.