Present participle; Past participle - rarefying - rarefied Present - rarefy - rarefy - rarefies - rarefy - rarefy - rarefy Past - rarefied - rarefied - rarefied - rarefied - rarefied - rarefied Future - will rarefy - will rarefy - will rarefy - will rarefy - will rarefy - will rarefy Present conditional - would rarefy - would rarefy - would rarefy - would rarefy - would rarefy - would rarefy Present Perfect - have rarefied - have rarefied - has rarefied - have rarefied - have rarefied - have rarefied Past Perfect - had rarefied - had rarefied - had rarefied - had rarefied - had rarefied - had rarefied Future Perfect - will have rarefied - will have rarefied - will have rarefied - will have rarefied - will have rarefied - will have rarefied Past conditional - would have rarefied - would have rarefied - would have rarefied - would have rarefied - would have rarefied - would have rarefied Imperative - - - rarefy - - - - - - - -