Kids are honest. Sometimes brutally so. If you are boring, they will tell you in one way or another. If they are very little, they will simply say. “Teacher, this is boring.” If they are older (and more polite) they might just stare out the window and look at the ceiling or the walls, but most teachers can tell if a kid is engaged in the lesson or not. Kids haven’t learned how to fake interest (few adults do it well, either). If you are open to a child’s honesty, it can really help you become a better teacher. If learning isn’t interesting, then kids aren’t interested. To take it one step further, if the writer interested (in the writing) the writing isn’t interesting.
To create honestly good pieces of writing, children need to be allowed to let their voices shine through. They need choices in their writing. Remember the old saying: Choice leads to Voice. It is true.