English verb conjugation
SHOULD UNDERLINE

Regular verb: underline - underlined - underlined

Affirmation

Simple form	V-ing form
I'd underline you'd underline he'd underline we'd underline you'd underline they'd underline	I'd be underlining you'd be underlining he'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 he 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 he 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 he 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 he 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 he 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 he 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 he underline? should we underline? should you underline? should they underline?	should I be underlining? should you be underlining? should he 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 he 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 he 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 he 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 he 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 he 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 he have been underlining? shouldn't we have been underlining? shouldn't you have been underlining? shouldn't they have been underlining?