Present participle; Past participle - coughing - coughed Present - cough - cough - coughs - cough - cough - cough Past - coughed - coughed - coughed - coughed - coughed - coughed Future - will cough - will cough - will cough - will cough - will cough - will cough Present conditional - would cough - would cough - would cough - would cough - would cough - would cough Present Perfect - have coughed - have coughed - has coughed - have coughed - have coughed - have coughed Past Perfect - had coughed - had coughed - had coughed - had coughed - had coughed - had coughed Future Perfect - will have coughed - will have coughed - will have coughed - will have coughed - will have coughed - will have coughed Past conditional - would have coughed - would have coughed - would have coughed - would have coughed - would have coughed - would have coughed Imperative - - - cough - - - - - - - -