Present participle; Past participle - grousing - groused Present - grouse - grouse - grouses - grouse - grouse - grouse Past - groused - groused - groused - groused - groused - groused Future - will grouse - will grouse - will grouse - will grouse - will grouse - will grouse Present conditional - would grouse - would grouse - would grouse - would grouse - would grouse - would grouse Present Perfect - have groused - have groused - has groused - have groused - have groused - have groused Past Perfect - had groused - had groused - had groused - had groused - had groused - had groused Future Perfect - will have groused - will have groused - will have groused - will have groused - will have groused - will have groused Past conditional - would have groused - would have groused - would have groused - would have groused - would have groused - would have groused Imperative - - - grouse - - - - - - - -