should perturb
Regular verb: perturb - perturbed- perturbed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not perturb
you should not perturb
he should not perturb
we should not perturb
you should not perturb
they should not perturb 	I should not be perturbing
you should not be perturbing
he should not be perturbing
we should not be perturbing
you should not be perturbing
they should not be perturbing	I should not have perturbed
you should not have perturbed
he should not have perturbed
we should not have perturbed
you should not have perturbed
they should not have perturbed	I should not have been perturbing
you should not have been perturbing
he should not have been perturbing
we should not have been perturbing
you should not have been perturbing
they should not 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 	
should I not perturb?
should you not perturb?
should he not perturb?
should we not perturb?
should you not perturb?
should they not perturb? 	should I not be perturbing?
should you not be perturbing?
should he not be perturbing?
should we not be perturbing?
should you not be perturbing?
should they not be perturbing? 	should I not have perturbed?
should you not have perturbed?
should he not have perturbed?
should we not have perturbed?
should you not have perturbed?
should they not have perturbed? 	should I not have been perturbing?
should you not have been perturbing?
should he not have been perturbing?
should we not have been perturbing?
should you not have been perturbing?
should they not have been perturbing?