An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Percentage of children over five (y-axis) passing each of the 15 complex syntactic categories (labelled on the abscissa). Syntactic categories are arranged in increasing order of difficulty (a lower percentage of children passing)