Present participle; Past participle - aching - ached Present - ache - ache - aches - ache - ache - ache Past - ached - ached - ached - ached - ached - ached Future - will ache - will ache - will ache - will ache - will ache - will ache Present conditional - would ache - would ache - would ache - would ache - would ache - would ache Present Perfect - have ached - have ached - has ached - have ached - have ached - have ached Past Perfect - had ached - had ached - had ached - had ached - had ached - had ached Future Perfect - will have ached - will have ached - will have ached - will have ached - will have ached - will have ached Past conditional - would have ached - would have ached - would have ached - would have ached - would have ached - would have ached Imperative - - - ache - - - - - - - -