English verb conjugation
SHOULD LENGTHEN

Regular verb: lengthen - lengthened - lengthened

Affirmation

Simple form	V-ing form
I should lengthen you should lengthen she should lengthen we should lengthen you should lengthen they should lengthen	I should be lengthening you should be lengthening she should be lengthening we should be lengthening you should be lengthening they should be lengthening
Perfect	V-ing perfect
I should have lengthened you should have lengthened she should have lengthened we should have lengthened you should have lengthened they should have lengthened	I should have been lengthening you should have been lengthening she should have been lengthening we should have been lengthening you should have been lengthening they should have been lengthening

Negation

Simple form	V-ing form
I should not lengthen you should not lengthen she should not lengthen we should not lengthen you should not lengthen they should not lengthen	I should not be lengthening you should not be lengthening she should not be lengthening we should not be lengthening you should not be lengthening they should not be lengthening
Perfect	V-ing perfect
I should not have lengthened you should not have lengthened she should not have lengthened we should not have lengthened you should not have lengthened they should not have lengthened	I should not have been lengthening you should not have been lengthening she should not have been lengthening we should not have been lengthening you should not have been lengthening they should not have been lengthening

Interrogative form

Simple form	V-ing form
should I lengthen? should you lengthen? should she lengthen? should we lengthen? should you lengthen? should they lengthen?	should I be lengthening? should you be lengthening? should she be lengthening? should we be lengthening? should you be lengthening? should they be lengthening?
Perfect	V-ing perfect
should I have lengthened? should you have lengthened? should she have lengthened? should we have lengthened? should you have lengthened? should they have lengthened?	should I have been lengthening? should you have been lengthening? should she have been lengthening? should we have been lengthening? should you have been lengthening? should they have been lengthening?

Interro-negative form

Simple form	V-ing form
should I not lengthen? should you not lengthen? should she not lengthen? should we not lengthen? should you not lengthen? should they not lengthen?	should I not be lengthening? should you not be lengthening? should she not be lengthening? should we not be lengthening? should you not be lengthening? should they not be lengthening?
Perfect	V-ing perfect
should I not have lengthened? should you not have lengthened? should she not have lengthened? should we not have lengthened? should you not have lengthened? should they not have lengthened?	should I not have been lengthening? should you not have been lengthening? should she not have been lengthening? should we not have been lengthening? should you not have been lengthening? should they not have been lengthening?