Present participle; Past participle - constricting - constricted Present - constrict - constrict - constricts - constrict - constrict - constrict Past - constricted - constricted - constricted - constricted - constricted - constricted Future - will constrict - will constrict - will constrict - will constrict - will constrict - will constrict Present conditional - would constrict - would constrict - would constrict - would constrict - would constrict - would constrict Present Perfect - have constricted - have constricted - has constricted - have constricted - have constricted - have constricted Past Perfect - had constricted - had constricted - had constricted - had constricted - had constricted - had constricted Future Perfect - will have constricted - will have constricted - will have constricted - will have constricted - will have constricted - will have constricted Past conditional - would have constricted - would have constricted - would have constricted - would have constricted - would have constricted - would have constricted Imperative - - - constrict - - - - - - - -