In fact, it has been shown that there are languages that have syntactic constructions which are context-sensitive (in a generative linguistic PoV. cf. http://en

In fact, it has been shown that there are languages that have syntactic constructions which are context-sensitive (in a generative linguistic PoV. cf. http://en.wikipedia.org/wiki/Chomsky_hierarchy http://en.wikipedia.org/wiki/Chomsky_hierarchy). For example Swiss German variants (http://books.google.com/books?id=JOjoWrP4tnIC&lpg=PA165&ots=Dd9UlGjRYA&dq=swiss%20german%20context-free&pg=PA165#v=onepage&q=Swiss%20German%20context-free&f=false http://books.google.com/books?id=JOjoWrP4tnIC&lpg=PA165&...)