
Regular verb: lack - lacked - lacked
Simple form | V-ing form | 
| I might lack you might lack he might lack we might lack you might lack they might lack  | I might be lacking you might be lacking he might be lacking we might be lacking you might be lacking they might be lacking  | 
Perfect | V-ing perfect | 
| I might have lacked you might have lacked he might have lacked we might have lacked you might have lacked they might have lacked  | I might have been lacking you might have been lacking he might have been lacking we might have been lacking you might have been lacking they might have been lacking  | 
Simple form | V-ing form | 
| I mightn't lack you mightn't lack he mightn't lack we mightn't lack you mightn't lack they mightn't lack  | I mightn't be lacking you mightn't be lacking he mightn't be lacking we mightn't be lacking you mightn't be lacking they mightn't be lacking  | 
Perfect | V-ing perfect | 
| I mightn't have lacked you mightn't have lacked he mightn't have lacked we mightn't have lacked you mightn't have lacked they mightn't have lacked  | I mightn't have been lacking you mightn't have been lacking he mightn't have been lacking we mightn't have been lacking you mightn't have been lacking they mightn't have been lacking  | 
Simple form | V-ing form | 
| might I lack? might you lack? might he lack? might we lack? might you lack? might they lack?  | might I be lacking? might you be lacking? might he be lacking? might we be lacking? might you be lacking? might they be lacking?  | 
Perfect | V-ing perfect | 
| might I have lacked? might you have lacked? might he have lacked? might we have lacked? might you have lacked? might they have lacked?  | might I have been lacking? might you have been lacking? might he have been lacking? might we have been lacking? might you have been lacking? might they have been lacking?  | 
Simple form | V-ing form | 
| mightn't I lack? mightn't you lack? mightn't he lack? mightn't we lack? mightn't you lack? mightn't they lack?  | mightn't I be lacking? mightn't you be lacking? mightn't he be lacking? mightn't we be lacking? mightn't you be lacking? mightn't they be lacking?  | 
Perfect | V-ing perfect | 
| mightn't I have lacked? mightn't you have lacked? mightn't he have lacked? mightn't we have lacked? mightn't you have lacked? mightn't they have lacked?  | mightn't I have been lacking? mightn't you have been lacking? mightn't he have been lacking? mightn't we have been lacking? mightn't you have been lacking? mightn't they have been lacking?  |