should perturb
Regular verb: perturb - perturbed- perturbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd perturb
you'd perturb
he'd perturb
we'd perturb
you'd perturb
they'd perturb 	I'd be perturbing
you'd be perturbing
he'd be perturbing
we'd be perturbing
you'd be perturbing
they'd be perturbing	I should've perturbed
you should've perturbed
he should've perturbed
we should've perturbed
you should've perturbed
they should've perturbed	I should've been perturbing
you should've been perturbing
he should've been perturbing
we should've been perturbing
you should've been perturbing
they should've been perturbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't perturb
you shouldn't perturb
he shouldn't perturb
we shouldn't perturb
you shouldn't perturb
they shouldn't perturb 	I shouldn't be perturbing
you shouldn't be perturbing
he shouldn't be perturbing
we shouldn't be perturbing
you shouldn't be perturbing
they shouldn't be perturbing	I shouldn't have perturbed
you shouldn't have perturbed
he shouldn't have perturbed
we shouldn't have perturbed
you shouldn't have perturbed
they shouldn't have perturbed	I shouldn't have been perturbing
you shouldn't have been perturbing
he shouldn't have been perturbing
we shouldn't have been perturbing
you shouldn't have been perturbing
they shouldn't have been perturbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I perturb?
should you perturb?
should he perturb?
should we perturb?
should you perturb?
should they perturb? 	should I be perturbing?
should you be perturbing?
should he be perturbing?
should we be perturbing?
should you be perturbing?
should they be perturbing? 	should I have perturbed?
should you have perturbed?
should he have perturbed?
should we have perturbed?
should you have perturbed?
should they have perturbed? 	should I have been perturbing?
should you have been perturbing?
should he have been perturbing?
should we have been perturbing?
should you have been perturbing?
should they have been perturbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I perturb?
shouldn't you perturb?
shouldn't he perturb?
shouldn't we perturb?
shouldn't you perturb?
shouldn't they perturb? 	shouldn't I be perturbing?
shouldn't you be perturbing?
shouldn't he be perturbing?
shouldn't we be perturbing?
shouldn't you be perturbing?
shouldn't they be perturbing? 	shouldn't I have perturbed?
shouldn't you have perturbed?
shouldn't he have perturbed?
shouldn't we have perturbed?
shouldn't you have perturbed?
shouldn't they have perturbed? 	shouldn't I have been perturbing?
shouldn't you have been perturbing?
shouldn't he have been perturbing?
shouldn't we have been perturbing?
shouldn't you have been perturbing?
shouldn't they have been perturbing?