Present participle; Past participle - threatening - threatened Present - threaten - threaten - threatens - threaten - threaten - threaten Past - threatened - threatened - threatened - threatened - threatened - threatened Future - will threaten - will threaten - will threaten - will threaten - will threaten - will threaten Present conditional - would threaten - would threaten - would threaten - would threaten - would threaten - would threaten Present Perfect - have threatened - have threatened - has threatened - have threatened - have threatened - have threatened Past Perfect - had threatened - had threatened - had threatened - had threatened - had threatened - had threatened Future Perfect - will have threatened - will have threatened - will have threatened - will have threatened - will have threatened - will have threatened Past conditional - would have threatened - would have threatened - would have threatened - would have threatened - would have threatened - would have threatened Imperative - - - threaten - - - - - - - -