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
I should've underlined you should've underlined he should've underlined we should've underlined you should've underlined they should've underlined
V-ing perfect
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
I shouldn't underline you shouldn't underline he shouldn't underline we shouldn't underline you shouldn't underline they shouldn't underline
V-ing form
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
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
V-ing perfect
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
should I underline? should you underline? should he underline? should we underline? should you underline? should they underline?
V-ing form
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
should I have underlined? should you have underlined? should he have underlined? should we have underlined? should you have underlined? should they have underlined?
V-ing perfect
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
shouldn't I underline? shouldn't you underline? shouldn't he underline? shouldn't we underline? shouldn't you underline? shouldn't they underline?
V-ing form
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
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?
V-ing perfect
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?