Present participle; Past participle - gnawing - gnawed Present - gnaw - gnaw - gnaws - gnaw - gnaw - gnaw Past - gnawed - gnawed - gnawed - gnawed - gnawed - gnawed Future - will gnaw - will gnaw - will gnaw - will gnaw - will gnaw - will gnaw Present conditional - would gnaw - would gnaw - would gnaw - would gnaw - would gnaw - would gnaw Present Perfect - have gnawed - have gnawed - has gnawed - have gnawed - have gnawed - have gnawed Past Perfect - had gnawed - had gnawed - had gnawed - had gnawed - had gnawed - had gnawed Future Perfect - will have gnawed - will have gnawed - will have gnawed - will have gnawed - will have gnawed - will have gnawed Past conditional - would have gnawed - would have gnawed - would have gnawed - would have gnawed - would have gnawed - would have gnawed Imperative - - - gnaw - - - - - - - -