Present participle; Past participle - appalling - appalled Present - appal - appal - appals - appal - appal - appal Past - appalled - appalled - appalled - appalled - appalled - appalled Future - will appal - will appal - will appal - will appal - will appal - will appal Present conditional - would appal - would appal - would appal - would appal - would appal - would appal Present Perfect - have appalled - have appalled - has appalled - have appalled - have appalled - have appalled Past Perfect - had appalled - had appalled - had appalled - had appalled - had appalled - had appalled Future Perfect - will have appalled - will have appalled - will have appalled - will have appalled - will have appalled - will have appalled Past conditional - would have appalled - would have appalled - would have appalled - would have appalled - would have appalled - would have appalled Imperative - - - appal - - - - - - - -