Present participle; Past participle - studying - studied Present - study - study - studies - study - study - study Past - studied - studied - studied - studied - studied - studied Future - will study - will study - will study - will study - will study - will study Present conditional - would study - would study - would study - would study - would study - would study Present Perfect - have studied - have studied - has studied - have studied - have studied - have studied Past Perfect - had studied - had studied - had studied - had studied - had studied - had studied Future Perfect - will have studied - will have studied - will have studied - will have studied - will have studied - will have studied Past conditional - would have studied - would have studied - would have studied - would have studied - would have studied - would have studied Imperative - - - study - - - - - - - -