there's lots of shades of greens
Green comes in many shades.
Green doesn't have many shades.
One child is quite prepared, while the other isn't.
There was no methodology for selecting evaluators.
That's a really good idea.
A woman is learning how to cook.
Two people are walking into a store.
William Roth's tax reduction is bigger than the tax cut Bill Archer is suggesting by a wide margin.