Sir, do we have to write in sentences? Yes, you bloody well do!
Students do a lot of writing at school but, bless me, most of it’s turgid stuff. In practically every lesson they’re required to scribble stuff down in their excise books, even if it’s only a learning objective and the date. Having spent a good deal of the past two terms observing lessons across the curriculum, I can safely say that most of the writing students do is an exercise in missed opportunities. And almost none of this writing is valued in any way other than for the content it contains.