Colourful Semantics is a system designed by Alison Bryan. It’s aim is to help children improve their grammar. The following video explains the background and how to use it:
The Integrated Treatment Services website has lots of downloadable resources that you can use to help your child develop the grammatical structure of their sentences through Colourful Semantics.
Here is the link to their resources section:
https://integratedtreatmentservices.co.uk/resources/speech-and-language-therapy/
Speech and Language Blog 