Summary: Here’s a strange little blue animal you’ve never seen before. It’s called a wug. Now here’s another one. There are two of them. There are two ___? You probably thought “wugs” – and even kids as young as 3 years old would agree with you. But how did you know this, if you’ve never heard the word “wug” before? What is it that you know, exactly, when you know how to add that -s? Now try saying two cat__
