Present participle; Past participle - staling - staled Present - stale - stale - stales - stale - stale - stale Past - staled - staled - staled - staled - staled - staled Future - will stale - will stale - will stale - will stale - will stale - will stale Present conditional - would stale - would stale - would stale - would stale - would stale - would stale Present Perfect - have staled - have staled - has staled - have staled - have staled - have staled Past Perfect - had staled - had staled - had staled - had staled - had staled - had staled Future Perfect - will have staled - will have staled - will have staled - will have staled - will have staled - will have staled Past conditional - would have staled - would have staled - would have staled - would have staled - would have staled - would have staled Imperative - - - stale - - - - - - - -