Language & WorldFact
The made-up creature that proved how kids learn grammar.
In 1958, Jean Berko showed children aged 4 to 7 a drawing: 'This is a wug.' Then two of them: 'Now there are two …' Most said 'wugs'. Since nobody had ever heard the word, they couldn't have memorised it. Children learn rules, not just words.
Useful: When a child says 'goed' instead of 'went', they're correctly applying a rule.
Source: en.wikipedia.org