So we need to put on the left side, if teachers do not have the power to make decisions in their own classrooms. The tricky thing here is that the other idea needs the knot that appeared earlier in the sentence. We're saying if teachers don't have the power to make decisions in their own classroom, then they cannot enable their students to make their own decisions. This was a weird phrasing where I could say, until you clean up your room, you cannot have dessert. But I also could have said, not until you clean up your room, can you have dessert? They would mean the same thing.