should retreat
Regular verb: retreat - retreated- retreated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd retreat
you'd retreat
she'd retreat
we'd retreat
you'd retreat
they'd retreat 	I'd be retreating
you'd be retreating
she'd be retreating
we'd be retreating
you'd be retreating
they'd be retreating	I should've retreated
you should've retreated
she should've retreated
we should've retreated
you should've retreated
they should've retreated	I should've been retreating
you should've been retreating
she should've been retreating
we should've been retreating
you should've been retreating
they should've been retreating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't retreat
you shouldn't retreat
she shouldn't retreat
we shouldn't retreat
you shouldn't retreat
they shouldn't retreat 	I shouldn't be retreating
you shouldn't be retreating
she shouldn't be retreating
we shouldn't be retreating
you shouldn't be retreating
they shouldn't be retreating	I shouldn't have retreated
you shouldn't have retreated
she shouldn't have retreated
we shouldn't have retreated
you shouldn't have retreated
they shouldn't have retreated	I shouldn't have been retreating
you shouldn't have been retreating
she 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 	V-ing form 	Perfect 	V-ing perfect 	
should I retreat?
should you retreat?
should she retreat?
should we retreat?
should you retreat?
should they retreat? 	should I be retreating?
should you be retreating?
should she be retreating?
should we be retreating?
should you be retreating?
should they be retreating? 	should I have retreated?
should you have retreated?
should she have retreated?
should we have retreated?
should you have retreated?
should they have retreated? 	should I have been retreating?
should you have been retreating?
should she have been retreating?
should we have been retreating?
should you have been retreating?
should they have been retreating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I retreat?
shouldn't you retreat?
shouldn't she retreat?
shouldn't we retreat?
shouldn't you retreat?
shouldn't they retreat? 	shouldn't I be retreating?
shouldn't you be retreating?
shouldn't she be retreating?
shouldn't we be retreating?
shouldn't you be retreating?
shouldn't they be retreating? 	shouldn't I have retreated?
shouldn't you have retreated?
shouldn't she have retreated?
shouldn't we have retreated?
shouldn't you have retreated?
shouldn't they have retreated? 	shouldn't I have been retreating?
shouldn't you have been retreating?
shouldn't she have been retreating?
shouldn't we have been retreating?
shouldn't you have been retreating?
shouldn't they have been retreating?