Present participle; Past participle - clogging - clogged Present - clog - clog - clogs - clog - clog - clog Past - clogged - clogged - clogged - clogged - clogged - clogged Future - will clog - will clog - will clog - will clog - will clog - will clog Present conditional - would clog - would clog - would clog - would clog - would clog - would clog Present Perfect - have clogged - have clogged - has clogged - have clogged - have clogged - have clogged Past Perfect - had clogged - had clogged - had clogged - had clogged - had clogged - had clogged Future Perfect - will have clogged - will have clogged - will have clogged - will have clogged - will have clogged - will have clogged Past conditional - would have clogged - would have clogged - would have clogged - would have clogged - would have clogged - would have clogged Imperative - - - clog - - - - - - - -