English verb conjugation
MAY LACK

Regular verb: lack - lacked - lacked

Affirmation

Simple form	V-ing form
I may lack you may lack he may lack we may lack you may lack they may lack	I may be lacking you may be lacking he may be lacking we may be lacking you may be lacking they may be lacking
Perfect	V-ing perfect
I may have lacked you may have lacked he may have lacked we may have lacked you may have lacked they may have lacked	I may have been lacking you may have been lacking he may have been lacking we may have been lacking you may have been lacking they may have been lacking

Negation

Simple form	V-ing form
I mayn't lack you mayn't lack he mayn't lack we mayn't lack you mayn't lack they mayn't lack	I mayn't be lacking you mayn't be lacking he mayn't be lacking we mayn't be lacking you mayn't be lacking they mayn't be lacking
Perfect	V-ing perfect
I mayn't have lacked you mayn't have lacked he mayn't have lacked we mayn't have lacked you mayn't have lacked they mayn't have lacked	I mayn't have been lacking you mayn't have been lacking he mayn't have been lacking we mayn't have been lacking you mayn't have been lacking they mayn't have been lacking

Interrogative form

Simple form	V-ing form
may I lack? may you lack? may he lack? may we lack? may you lack? may they lack?	may I be lacking? may you be lacking? may he be lacking? may we be lacking? may you be lacking? may they be lacking?
Perfect	V-ing perfect
may I have lacked? may you have lacked? may he have lacked? may we have lacked? may you have lacked? may they have lacked?	may I have been lacking? may you have been lacking? may he have been lacking? may we have been lacking? may you have been lacking? may they have been lacking?

Interro-negative form

Simple form	V-ing form
mayn't I lack? mayn't you lack? mayn't he lack? mayn't we lack? mayn't you lack? mayn't they lack?	mayn't I be lacking? mayn't you be lacking? mayn't he be lacking? mayn't we be lacking? mayn't you be lacking? mayn't they be lacking?
Perfect	V-ing perfect
mayn't I have lacked? mayn't you have lacked? mayn't he have lacked? mayn't we have lacked? mayn't you have lacked? mayn't they have lacked?	mayn't I have been lacking? mayn't you have been lacking? mayn't he have been lacking? mayn't we have been lacking? mayn't you have been lacking? mayn't they have been lacking?