Present participle; Past participle - researching - researched Present - research - research - researches - research - research - research Past - researched - researched - researched - researched - researched - researched Future - will research - will research - will research - will research - will research - will research Present conditional - would research - would research - would research - would research - would research - would research Present Perfect - have researched - have researched - has researched - have researched - have researched - have researched Past Perfect - had researched - had researched - had researched - had researched - had researched - had researched Future Perfect - will have researched - will have researched - will have researched - will have researched - will have researched - will have researched Past conditional - would have researched - would have researched - would have researched - would have researched - would have researched - would have researched Imperative - - - research - - - - - - - -