
Regular verb: lack - lacked - lacked
Present | Present continuous | Preterite | Preterite continuous | 
|  don't I lack? don't you lack? doesn't she lack? don't we lack? don't you lack? don't they lack?  | am I not lacking? aren't you lacking? isn't she lacking? aren't we lacking? aren't you lacking? aren't they lacking?  | didn't I lack? didn't you lack? didn't she lack? didn't we lack? didn't you lack? didn't they lack?  |  wasn't I lacking? weren't you lacking? wasn't she lacking? weren't we lacking? weren't you lacking? weren't they lacking?  | 
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| haven't I lacked? haven't you lacked? hasn't she lacked? haven't we lacked? haven't you lacked? haven't they lacked?  | haven't I been lacking? haven't you been lacking? hasn't she been lacking? haven't we been lacking? haven't you been lacking? haven't they been lacking?  | hadn't I lacked? hadn't you lacked? hadn't she lacked? hadn't we lacked? hadn't you lacked? hadn't they lacked?  | hadn't I been lacking? hadn't you been lacking? hadn't she been lacking? hadn't we been lacking? hadn't you been lacking? hadn't they been lacking?  | 
Future | Future continuous | Future perfect | Future perfect continuous | 
| won't I lack? won't you lack? won't she lack? won't we lack? won't you lack? won't they lack?  | won't I be lacking? won't you be lacking? won't she be lacking? won't we be lacking? won't you be lacking? won't they be lacking?  | won't I have lacked? won't you have lacked? won't she have lacked? won't we have lacked? won't you have lacked? won't they have lacked?  | won't I have been lacking? won't you have been lacking? won't she have been lacking? won't we have been lacking? won't you have been lacking? won't they have been lacking?  | 
Present | Present continuous | Past | Past continuous | 
| wouldn't I lack? wouldn't you lack? wouldn't she lack? wouldn't we lack? wouldn't you lack? wouldn't they lack?  | wouldn't I be lacking? wouldn't you be lacking? wouldn't she be lacking? wouldn't we be lacking? wouldn't you be lacking? wouldn't they be lacking?  | wouldn't I have lacked? wouldn't you have lacked? wouldn't she have lacked? wouldn't we have lacked? wouldn't you have lacked? wouldn't they have lacked?  | wouldn't I have been lacking? wouldn't you have been lacking? wouldn't she have been lacking? wouldn't we have been lacking? wouldn't you have been lacking? wouldn't they have been lacking?  | 
Infinitive | Imperative | 
Infinitive | Imperative | ||
| to lack | - - -  | 
Present | Past | ||
| lacking | lacked |