Present participle; Past participle - sleekening - sleekened Present - sleeken - sleeken - sleekens - sleeken - sleeken - sleeken Past - sleekened - sleekened - sleekened - sleekened - sleekened - sleekened Future - will sleeken - will sleeken - will sleeken - will sleeken - will sleeken - will sleeken Present conditional - would sleeken - would sleeken - would sleeken - would sleeken - would sleeken - would sleeken Present Perfect - have sleekened - have sleekened - has sleekened - have sleekened - have sleekened - have sleekened Past Perfect - had sleekened - had sleekened - had sleekened - had sleekened - had sleekened - had sleekened Future Perfect - will have sleekened - will have sleekened - will have sleekened - will have sleekened - will have sleekened - will have sleekened Past conditional - would have sleekened - would have sleekened - would have sleekened - would have sleekened - would have sleekened - would have sleekened Imperative - - - sleeken - - - - - - - -