What About the Plural Forms?

The anglo saxons used that other indo european root word, air. They would say thu ert, which later became thou art. This form pushed out u b or thu beast as a construction but it didn't survive beyond the early modern english period. So when it comes to our modern singular forms, an, m is and are, we used them to day in much the same way that they were used in old English. But what about the plural formswe this is where things have changed. And once again, this is where the vikings played a role.