Present participle; Past participle - twinning - twinned Present - twin - twin - twins - twin - twin - twin Past - twinned - twinned - twinned - twinned - twinned - twinned Future - will twin - will twin - will twin - will twin - will twin - will twin Present conditional - would twin - would twin - would twin - would twin - would twin - would twin Present Perfect - have twinned - have twinned - has twinned - have twinned - have twinned - have twinned Past Perfect - had twinned - had twinned - had twinned - had twinned - had twinned - had twinned Future Perfect - will have twinned - will have twinned - will have twinned - will have twinned - will have twinned - will have twinned Past conditional - would have twinned - would have twinned - would have twinned - would have twinned - would have twinned - would have twinned Imperative - - - twin - - - - - - - -