What do you think is wrong with this way of starting a Japanese lesson?

I still remember an eye-opening story my teacher taught me when I was taking a Japanese teacher training course.The teacher ...
NHK

Teach Us, Teacher

You use DESHÔ at the end of a sentence, when you talk about a prediction for the future or something uncertain. When you use it in combination with nouns or adjectives, you replace DESU at the end of ...