I'd be retreating you'd be retreating he'd be retreating we'd be retreating you'd be retreating they'd be retreating
Perfect
I should've retreated you should've retreated he should've retreated we should've retreated you should've retreated they should've retreated
V-ing perfect
I should've been retreating you should've been retreating he should've been retreating we should've been retreating you should've been retreating they should've been retreating
Negation
Simple form
I shouldn't retreat you shouldn't retreat he shouldn't retreat we shouldn't retreat you shouldn't retreat they shouldn't retreat
V-ing form
I shouldn't be retreating you shouldn't be retreating he shouldn't be retreating we shouldn't be retreating you shouldn't be retreating they shouldn't be retreating
Perfect
I shouldn't have retreated you shouldn't have retreated he shouldn't have retreated we shouldn't have retreated you shouldn't have retreated they shouldn't have retreated
V-ing perfect
I shouldn't have been retreating you shouldn't have been retreating he shouldn't have been retreating we shouldn't have been retreating you shouldn't have been retreating they shouldn't have been retreating
Interrogative form
Simple form
should I retreat? should you retreat? should he retreat? should we retreat? should you retreat? should they retreat?
V-ing form
should I be retreating? should you be retreating? should he be retreating? should we be retreating? should you be retreating? should they be retreating?
Perfect
should I have retreated? should you have retreated? should he have retreated? should we have retreated? should you have retreated? should they have retreated?
V-ing perfect
should I have been retreating? should you have been retreating? should he have been retreating? should we have been retreating? should you have been retreating? should they have been retreating?
Interro-negative form
Simple form
shouldn't I retreat? shouldn't you retreat? shouldn't he retreat? shouldn't we retreat? shouldn't you retreat? shouldn't they retreat?
V-ing form
shouldn't I be retreating? shouldn't you be retreating? shouldn't he be retreating? shouldn't we be retreating? shouldn't you be retreating? shouldn't they be retreating?
Perfect
shouldn't I have retreated? shouldn't you have retreated? shouldn't he have retreated? shouldn't we have retreated? shouldn't you have retreated? shouldn't they have retreated?
V-ing perfect
shouldn't I have been retreating? shouldn't you have been retreating? shouldn't he have been retreating? shouldn't we have been retreating? shouldn't you have been retreating? shouldn't they have been retreating?