CSFG member Simon Dewar, currently editing the Suspended in Dusk 2 anthology, has been reading a lot of slush lately. He offer this very useful advice on tightening up your prose by hunting down and eliminating filter words:
One of the worst culprits for weakening your prose, distancing our reader from the protagonist’s point of view and the action, are filter words. This is where you say “John thought x y z ” or “It seemed as though x y z” or you say your character thinks/knows/realises/notices/decides/wonders things… rather than just showing the character doing those things.
A great example (and perhaps the most obvious) is if I write “John saw the big man lift his pistol and fire.” You don’t need to tell us John saw it… John is present in the scene and is our POV character. Unless John is blind, the default position is that he sees the things that go on in the scene. And if he was blind, you wouldn’t be saying he’d seen something, right? Instead of “John saw the big man lift his pistol and fire.” just write “The big man lifted his pistol and fired.”