Preschool Units of Inquiry Preschool classes participate in four units of inquiry throughout the year. Click on each unit below to learn more. Translate this page English አማርኛ العربية Español فارسی 한국어 اردو Tiếng Việt 中文 Other Language Unit 1 - How we express ourselves Unit 2 - Who we are Unit 3 - How we organize ourselves Unit 4 - How the world works