English verb conjugation
SHOULD JACKKNIFE

Regular verb: jackknife - jackknifed - jackknifed

Affirmation

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

Negation

Simple form	V-ing form
I should not jackknife you should not jackknife he should not jackknife we should not jackknife you should not jackknife they should not jackknife	I should not be jackknifing you should not be jackknifing he should not be jackknifing we should not be jackknifing you should not be jackknifing they should not be jackknifing
Perfect	V-ing perfect
I should not have jackknifed you should not have jackknifed he should not have jackknifed we should not have jackknifed you should not have jackknifed they should not have jackknifed	I should not have been jackknifing you should not have been jackknifing he should not have been jackknifing we should not have been jackknifing you should not have been jackknifing they should not have been jackknifing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
should I not jackknife? should you not jackknife? should he not jackknife? should we not jackknife? should you not jackknife? should they not jackknife?	should I not be jackknifing? should you not be jackknifing? should he not be jackknifing? should we not be jackknifing? should you not be jackknifing? should they not be jackknifing?
Perfect	V-ing perfect
should I not have jackknifed? should you not have jackknifed? should he not have jackknifed? should we not have jackknifed? should you not have jackknifed? should they not have jackknifed?	should I not have been jackknifing? should you not have been jackknifing? should he not have been jackknifing? should we not have been jackknifing? should you not have been jackknifing? should they not have been jackknifing?