Present participle; Past participle - fastening - fastened Present - fasten - fasten - fastens - fasten - fasten - fasten Past - fastened - fastened - fastened - fastened - fastened - fastened Future - will fasten - will fasten - will fasten - will fasten - will fasten - will fasten Present conditional - would fasten - would fasten - would fasten - would fasten - would fasten - would fasten Present Perfect - have fastened - have fastened - has fastened - have fastened - have fastened - have fastened Past Perfect - had fastened - had fastened - had fastened - had fastened - had fastened - had fastened Future Perfect - will have fastened - will have fastened - will have fastened - will have fastened - will have fastened - will have fastened Past conditional - would have fastened - would have fastened - would have fastened - would have fastened - would have fastened - would have fastened Imperative - - - fasten - - - - - - - -