My students have been working on article and noun agreement in class. We also have been working on subject and verb agreement. We put it all together in the patterning of singular and plural. They created sentences and then labeled them as singular (1) or plural (+1). I learned about placing the proof above the words from Grammar Keepers by Gretchen Bernabei.
I will post more photos of their books that they made with me. Here is some of their work: