Present participle; Past participle - buying - bought Present - buy - buy - buys - buy - buy - buy Past - bought - bought - bought - bought - bought - bought Future - will buy - will buy - will buy - will buy - will buy - will buy Present conditional - would buy - would buy - would buy - would buy - would buy - would buy Present Perfect - have bought - have bought - has bought - have bought - have bought - have bought Past Perfect - had bought - had bought - had bought - had bought - had bought - had bought Future Perfect - will have bought - will have bought - will have bought - will have bought - will have bought - will have bought Past conditional - would have bought - would have bought - would have bought - would have bought - would have bought - would have bought Imperative - - - buy - - - - - - - -