We use Syntactic Rules without being able to articulate what those rules are.
A third interesting fact about syntax is that we all employ syntactic rules very effectively, if not even effortlessly (How many morphemes in that word?).
But when asked to describe what those rules are, we are nearly speechless.
We must enroll in convoluted English Grammar courses to even have a notion of what the rules are that we are following.
How, the natavists ask, can we learn something without knowing what it is we learned? I'll pass on answering that question.
The fourth interesting feature about syntax is the amount of linguistic information that can be packed into a short simple sentence. Take, for instance, a short three word question like, "Can't I play?"