We are researchers from the University of Warwick and University of Reading studying young bilingual children’s language development. Studies have shown that 20% of children in the UK schools are bilingual – meaning that they can speak another language in addition to English. Among this group, Polish is one of the most common languages spoken by pupils at home. Polish and English are similar in some way but different in others. We want to find out how bilingual pupils learn their two languages and how their experience of one language affects the production and learning of the other language. In our current study we have decided to look more closely at how bilingual children learn how to use different sentences to describe pictures.