noun - a full-size or scaled model of a design used to show, test, or evaluate how something will look or work before it is made
noun - a tense that is used for actions that happened at some point in the past or happened regularly in the past, were generally true etc. Verbs usually have the ending -ED and in questions and negatives we usually use DID / DIDN'T
noun - an educational institution for young children before they start primary school, typically for ages 2 to 5