Present participle; Past participle - felling - felled Present - fell - fell - fells - fell - fell - fell Past - felled - felled - felled - felled - felled - felled Future - will fell - will fell - will fell - will fell - will fell - will fell Present conditional - would fell - would fell - would fell - would fell - would fell - would fell Present Perfect - have felled - have felled - has felled - have felled - have felled - have felled Past Perfect - had felled - had felled - had felled - had felled - had felled - had felled Future Perfect - will have felled - will have felled - will have felled - will have felled - will have felled - will have felled Past conditional - would have felled - would have felled - would have felled - would have felled - would have felled - would have felled Imperative - - - fell - - - - - - - -