English verb conjugation
SHOULD UNDERLINE

Regular verb: underline - underlined - underlined

Affirmation

Simple form	V-ing form
I'd underline you'd underline she'd underline we'd underline you'd underline they'd underline	I'd be underlining you'd be underlining she'd be underlining we'd be underlining you'd be underlining they'd be underlining
Perfect	V-ing perfect
I should've underlined you should've underlined she should've underlined we should've underlined you should've underlined they should've underlined	I should've been underlining you should've been underlining she should've been underlining we should've been underlining you should've been underlining they should've been underlining

Negation

Simple form	V-ing form
I shouldn't underline you shouldn't underline she shouldn't underline we shouldn't underline you shouldn't underline they shouldn't underline	I shouldn't be underlining you shouldn't be underlining she shouldn't be underlining we shouldn't be underlining you shouldn't be underlining they shouldn't be underlining
Perfect	V-ing perfect
I shouldn't have underlined you shouldn't have underlined she shouldn't have underlined we shouldn't have underlined you shouldn't have underlined they shouldn't have underlined	I shouldn't have been underlining you shouldn't have been underlining she shouldn't have been underlining we shouldn't have been underlining you shouldn't have been underlining they shouldn't have been underlining

Interrogative form

Simple form	V-ing form
should I underline? should you underline? should she underline? should we underline? should you underline? should they underline?	should I be underlining? should you be underlining? should she be underlining? should we be underlining? should you be underlining? should they be underlining?
Perfect	V-ing perfect
should I have underlined? should you have underlined? should she have underlined? should we have underlined? should you have underlined? should they have underlined?	should I have been underlining? should you have been underlining? should she have been underlining? should we have been underlining? should you have been underlining? should they have been underlining?

Interro-negative form

Simple form	V-ing form
shouldn't I underline? shouldn't you underline? shouldn't she underline? shouldn't we underline? shouldn't you underline? shouldn't they underline?	shouldn't I be underlining? shouldn't you be underlining? shouldn't she be underlining? shouldn't we be underlining? shouldn't you be underlining? shouldn't they be underlining?
Perfect	V-ing perfect
shouldn't I have underlined? shouldn't you have underlined? shouldn't she have underlined? shouldn't we have underlined? shouldn't you have underlined? shouldn't they have underlined?	shouldn't I have been underlining? shouldn't you have been underlining? shouldn't she have been underlining? shouldn't we have been underlining? shouldn't you have been underlining? shouldn't they have been underlining?