Present participle; Past participle - quickening - quickened Present - quicken - quicken - quickens - quicken - quicken - quicken Past - quickened - quickened - quickened - quickened - quickened - quickened Future - will quicken - will quicken - will quicken - will quicken - will quicken - will quicken Present conditional - would quicken - would quicken - would quicken - would quicken - would quicken - would quicken Present Perfect - have quickened - have quickened - has quickened - have quickened - have quickened - have quickened Past Perfect - had quickened - had quickened - had quickened - had quickened - had quickened - had quickened Future Perfect - will have quickened - will have quickened - will have quickened - will have quickened - will have quickened - will have quickened Past conditional - would have quickened - would have quickened - would have quickened - would have quickened - would have quickened - would have quickened Imperative - - - quicken - - - - - - - -