Present participle; Past participle - amassing - amassed Present - amass - amass - amasses - amass - amass - amass Past - amassed - amassed - amassed - amassed - amassed - amassed Future - will amass - will amass - will amass - will amass - will amass - will amass Present conditional - would amass - would amass - would amass - would amass - would amass - would amass Present Perfect - have amassed - have amassed - has amassed - have amassed - have amassed - have amassed Past Perfect - had amassed - had amassed - had amassed - had amassed - had amassed - had amassed Future Perfect - will have amassed - will have amassed - will have amassed - will have amassed - will have amassed - will have amassed Past conditional - would have amassed - would have amassed - would have amassed - would have amassed - would have amassed - would have amassed Imperative - - - amass - - - - - - - -