English verb conjugation
SHOULD THREAD

Regular verb: thread - threaded - threaded

Affirmation

Simple form	V-ing form
I should thread you should thread she should thread we should thread you should thread they should thread	I should be threading you should be threading she should be threading we should be threading you should be threading they should be threading
Perfect	V-ing perfect
I should have threaded you should have threaded she should have threaded we should have threaded you should have threaded they should have threaded	I should have been threading you should have been threading she should have been threading we should have been threading you should have been threading they should have been threading

Negation

Simple form	V-ing form
I should not thread you should not thread she should not thread we should not thread you should not thread they should not thread	I should not be threading you should not be threading she should not be threading we should not be threading you should not be threading they should not be threading
Perfect	V-ing perfect
I should not have threaded you should not have threaded she should not have threaded we should not have threaded you should not have threaded they should not have threaded	I should not have been threading you should not have been threading she should not have been threading we should not have been threading you should not have been threading they should not have been threading

Interrogative form

Simple form	V-ing form
should I thread? should you thread? should she thread? should we thread? should you thread? should they thread?	should I be threading? should you be threading? should she be threading? should we be threading? should you be threading? should they be threading?
Perfect	V-ing perfect
should I have threaded? should you have threaded? should she have threaded? should we have threaded? should you have threaded? should they have threaded?	should I have been threading? should you have been threading? should she have been threading? should we have been threading? should you have been threading? should they have been threading?

Interro-negative form

Simple form	V-ing form
should I not thread? should you not thread? should she not thread? should we not thread? should you not thread? should they not thread?	should I not be threading? should you not be threading? should she not be threading? should we not be threading? should you not be threading? should they not be threading?
Perfect	V-ing perfect
should I not have threaded? should you not have threaded? should she not have threaded? should we not have threaded? should you not have threaded? should they not have threaded?	should I not have been threading? should you not have been threading? should she not have been threading? should we not have been threading? should you not have been threading? should they not have been threading?