Why the mph salary range is suddenly jumping across the country
Why is a just a rather odd wh -word. Its distribution is very limited -- it can only have the word reason as its antecedent, and since it's never the subject it's always deletable. Consequently it behaves strangely, as you and others point out. Ticket for going 16 mph over posted speed limit; Court not mandatory ...
Jumping multiple lanes traveling ~20 mph slower than traffic. (skip to ...
