Attacking a sentence

I'm trying to attack a Keepass hash where I suspect the password is in the form of an english sentence (english words separated by spaces). Most likely the sentence will have a semantic meaning, not just a random list of words.

Currently I'm using the google- top-10000-english wordlist in combinator attack to create strings in the form of:

"word1 word2 word3 etc."

Any suggestion on how I can make this attack more efficient?

Better wordlist?

Discard sentences without any semantic meaning? (how?)

Please share you experience...