Present participle; Past participle - cautioning - cautioned Present - caution - caution - cautions - caution - caution - caution Past - cautioned - cautioned - cautioned - cautioned - cautioned - cautioned Future - will caution - will caution - will caution - will caution - will caution - will caution Present conditional - would caution - would caution - would caution - would caution - would caution - would caution Present Perfect - have cautioned - have cautioned - has cautioned - have cautioned - have cautioned - have cautioned Past Perfect - had cautioned - had cautioned - had cautioned - had cautioned - had cautioned - had cautioned Future Perfect - will have cautioned - will have cautioned - will have cautioned - will have cautioned - will have cautioned - will have cautioned Past conditional - would have cautioned - would have cautioned - would have cautioned - would have cautioned - would have cautioned - would have cautioned Imperative - - - caution - - - - - - - -