Present participle; Past participle - skiing - skied Present - ski - ski - skis - ski - ski - ski Past - skied - skied - skied - skied - skied - skied Future - will ski - will ski - will ski - will ski - will ski - will ski Present conditional - would ski - would ski - would ski - would ski - would ski - would ski Present Perfect - have skied - have skied - has skied - have skied - have skied - have skied Past Perfect - had skied - had skied - had skied - had skied - had skied - had skied Future Perfect - will have skied - will have skied - will have skied - will have skied - will have skied - will have skied Past conditional - would have skied - would have skied - would have skied - would have skied - would have skied - would have skied Imperative - - - ski - - - - - - - -