I should lighten you should lighten he should lighten we should lighten you should lighten they should lighten
V-ing form
I should be lightening you should be lightening he should be lightening we should be lightening you should be lightening they should be lightening
Perfect
I should have lightened you should have lightened he should have lightened we should have lightened you should have lightened they should have lightened
V-ing perfect
I should have been lightening you should have been lightening he should have been lightening we should have been lightening you should have been lightening they should have been lightening
Negation
Simple form
I should not lighten you should not lighten he should not lighten we should not lighten you should not lighten they should not lighten
V-ing form
I should not be lightening you should not be lightening he should not be lightening we should not be lightening you should not be lightening they should not be lightening
Perfect
I should not have lightened you should not have lightened he should not have lightened we should not have lightened you should not have lightened they should not have lightened
V-ing perfect
I should not have been lightening you should not have been lightening he should not have been lightening we should not have been lightening you should not have been lightening they should not have been lightening
Interrogative form
Simple form
should I lighten? should you lighten? should he lighten? should we lighten? should you lighten? should they lighten?
V-ing form
should I be lightening? should you be lightening? should he be lightening? should we be lightening? should you be lightening? should they be lightening?
Perfect
should I have lightened? should you have lightened? should he have lightened? should we have lightened? should you have lightened? should they have lightened?
V-ing perfect
should I have been lightening? should you have been lightening? should he have been lightening? should we have been lightening? should you have been lightening? should they have been lightening?
Interro-negative form
Simple form
should I not lighten? should you not lighten? should he not lighten? should we not lighten? should you not lighten? should they not lighten?
V-ing form
should I not be lightening? should you not be lightening? should he not be lightening? should we not be lightening? should you not be lightening? should they not be lightening?
Perfect
should I not have lightened? should you not have lightened? should he not have lightened? should we not have lightened? should you not have lightened? should they not have lightened?
V-ing perfect
should I not have been lightening? should you not have been lightening? should he not have been lightening? should we not have been lightening? should you not have been lightening? should they not have been lightening?