Present participle; Past participle - clumping - clumped Present - clump - clump - clumps - clump - clump - clump Past - clumped - clumped - clumped - clumped - clumped - clumped Future - will clump - will clump - will clump - will clump - will clump - will clump Present conditional - would clump - would clump - would clump - would clump - would clump - would clump Present Perfect - have clumped - have clumped - has clumped - have clumped - have clumped - have clumped Past Perfect - had clumped - had clumped - had clumped - had clumped - had clumped - had clumped Future Perfect - will have clumped - will have clumped - will have clumped - will have clumped - will have clumped - will have clumped Past conditional - would have clumped - would have clumped - would have clumped - would have clumped - would have clumped - would have clumped Imperative - - - clump - - - - - - - -