Although education (or the lack of it) plays a large part in the inability of young people to communicate properly, it goes far deeper than that. Have a look at this:
http://www.telegraph....-starting-school.html
I have provided a link to The Telegraph article, but similar information is available in most of today’s publications.
There are huge numbers of children and young adults who cannot properly converse or make themselves understood readily. The reasons are complex and various but many of them suffer from the sort of treatment outlined in the article. Time and again you see young mothers pushing their charges in forward facing pushchairs whilst engrossed for lengthy periods on the phone either talking or texting. The child might just as well be a sack of coal for all the interaction that is provided for it whilst it is out. No doubt it is in a similar. situation when it is returned home where there are even more distractions to occupy Mummy's time.
Then you hear of schools where progression in English is discouraged because it is too complicated and who prefer instead to ”celebrate the differences and diversity their pupils bring with them”. Many such children live in homes where a language other than English is most widely spoken.
Of course there will be variations in language competence wherever you look, but children who live in homes where they are barely spoken to in comprehensible English have very little chance.