It seems to me that in general, people with greater intelligence seem to have a better grasp of the English language, if only because people have a tendency to talk to them more and thus they have more opportunities to practice it.
This isn't completely clear cut though, as I've come across many people in my (admittedly short) life that are extremely clever but have trouble stringing two coherent sentences together.
@ Gary - It's always been my opinion that if you have acquired a skill in something, no matter what it is, then you are more intelligent as a result. Put simply, because you know more afterwards than you did when you started then you must have gained some degree of knowledge and thus are more intelligent. Of course, that's only if you are saying intelligence is determined by how much you know
This isn't completely clear cut though, as I've come across many people in my (admittedly short) life that are extremely clever but have trouble stringing two coherent sentences together.
@ Gary - It's always been my opinion that if you have acquired a skill in something, no matter what it is, then you are more intelligent as a result. Put simply, because you know more afterwards than you did when you started then you must have gained some degree of knowledge and thus are more intelligent. Of course, that's only if you are saying intelligence is determined by how much you know