English verb conjugation
MAY JACKKNIFE

Regular verb: jackknife - jackknifed - jackknifed

Affirmation

Simple form	V-ing form
I may jackknife you may jackknife he may jackknife we may jackknife you may jackknife they may jackknife	I may be jackknifing you may be jackknifing he may be jackknifing we may be jackknifing you may be jackknifing they may be jackknifing
Perfect	V-ing perfect
I may have jackknifed you may have jackknifed he may have jackknifed we may have jackknifed you may have jackknifed they may have jackknifed	I may have been jackknifing you may have been jackknifing he may have been jackknifing we may have been jackknifing you may have been jackknifing they may have been jackknifing

Negation

Simple form	V-ing form
I mayn't jackknife you mayn't jackknife he mayn't jackknife we mayn't jackknife you mayn't jackknife they mayn't jackknife	I mayn't be jackknifing you mayn't be jackknifing he mayn't be jackknifing we mayn't be jackknifing you mayn't be jackknifing they mayn't be jackknifing
Perfect	V-ing perfect
I mayn't have jackknifed you mayn't have jackknifed he mayn't have jackknifed we mayn't have jackknifed you mayn't have jackknifed they mayn't have jackknifed	I mayn't have been jackknifing you mayn't have been jackknifing he mayn't have been jackknifing we mayn't have been jackknifing you mayn't have been jackknifing they mayn't have been jackknifing

Interrogative form

Simple form	V-ing form
may I jackknife? may you jackknife? may he jackknife? may we jackknife? may you jackknife? may they jackknife?	may I be jackknifing? may you be jackknifing? may he be jackknifing? may we be jackknifing? may you be jackknifing? may they be jackknifing?
Perfect	V-ing perfect
may I have jackknifed? may you have jackknifed? may he have jackknifed? may we have jackknifed? may you have jackknifed? may they have jackknifed?	may I have been jackknifing? may you have been jackknifing? may he have been jackknifing? may we have been jackknifing? may you have been jackknifing? may they have been jackknifing?

Interro-negative form

Simple form	V-ing form
mayn't I jackknife? mayn't you jackknife? mayn't he jackknife? mayn't we jackknife? mayn't you jackknife? mayn't they jackknife?	mayn't I be jackknifing? mayn't you be jackknifing? mayn't he be jackknifing? mayn't we be jackknifing? mayn't you be jackknifing? mayn't they be jackknifing?
Perfect	V-ing perfect
mayn't I have jackknifed? mayn't you have jackknifed? mayn't he have jackknifed? mayn't we have jackknifed? mayn't you have jackknifed? mayn't they have jackknifed?	mayn't I have been jackknifing? mayn't you have been jackknifing? mayn't he have been jackknifing? mayn't we have been jackknifing? mayn't you have been jackknifing? mayn't they have been jackknifing?