Present participle; Past participle - skulking - skulked Present - skulk - skulk - skulks - skulk - skulk - skulk Past - skulked - skulked - skulked - skulked - skulked - skulked Future - will skulk - will skulk - will skulk - will skulk - will skulk - will skulk Present conditional - would skulk - would skulk - would skulk - would skulk - would skulk - would skulk Present Perfect - have skulked - have skulked - has skulked - have skulked - have skulked - have skulked Past Perfect - had skulked - had skulked - had skulked - had skulked - had skulked - had skulked Future Perfect - will have skulked - will have skulked - will have skulked - will have skulked - will have skulked - will have skulked Past conditional - would have skulked - would have skulked - would have skulked - would have skulked - would have skulked - would have skulked Imperative - - - skulk - - - - - - - -