Present participle; Past participle - curbing - curbed Present - curb - curb - curbs - curb - curb - curb Past - curbed - curbed - curbed - curbed - curbed - curbed Future - will curb - will curb - will curb - will curb - will curb - will curb Present conditional - would curb - would curb - would curb - would curb - would curb - would curb Present Perfect - have curbed - have curbed - has curbed - have curbed - have curbed - have curbed Past Perfect - had curbed - had curbed - had curbed - had curbed - had curbed - had curbed Future Perfect - will have curbed - will have curbed - will have curbed - will have curbed - will have curbed - will have curbed Past conditional - would have curbed - would have curbed - would have curbed - would have curbed - would have curbed - would have curbed Imperative - - - curb - - - - - - - -