It flows, and it reflects the immediacy of their experience. Two specific problems face these children when we ask them to write. How to tackle these problems. Start with composition, but not with written composition. When they are confident about that, move to small pieces of writing, dealing with single experiences or feelings which are important to them.
Poetic forms are useful here.
Go for the feeling, every time. As far as writing about Literature is concerned, any simple response work is fairly easy to to achieve, but analytical work is far more difficult. To help the student cope with finding content and structuring what they write, prepare a carefully sequenced set of questions which, when when answered in sequence and in full sentences, will help with the creation of paragraphs, and with the sequencing of those paragraphs. More work, but it can succeed. Be flexible and opportunistic.