If your school intake has a large proportion immigrants - for example polish, czech,somali or some time ago serbo croat and the children do not speak english, and their paretns only sparingly, they will take longer to teach, and therefore almost aways take more of the teachers time. This is especaily so for younger children. They are so tired at the end of the day they come home and speak their native language with their paretns, their parents will find reading isntructions and reading stories in english difficult . it is true that children learn quickly but of course they take up extra resources which schools are not properly funded for. yes we know parents that are from different esp european countries that raise their children as tri-lingual - but they both spoke english themselves and their children obtained fantastic language qualifications. They were highly educated which also assists.