Wow, thnx a lot for this amazing explanation

Marvelous! Thank you Graham, what a clear explanation you've presented!

I just loved the explanation. How you played with the Cuisenaire rods to go deeper on grammar but in a different way was just really good! One day I'm going to implement that in my courses. Thank you!

That was very good, I've just bought my first set of rods!

Thank you. i like how you put a second rod in "is" to transform it in "are"

SDU is the best

Thank you so much.