English verb conjugation
CAN PERTURB

Regular verb: perturb - perturbed - perturbed

Affirmation

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

Negation

Simple form	V-ing form
I cannot perturb you cannot perturb he cannot perturb we cannot perturb you cannot perturb they cannot perturb	I cannot be perturbing you cannot be perturbing he cannot be perturbing we cannot be perturbing you cannot be perturbing they cannot be perturbing
Perfect	V-ing perfect
I cannot have perturbed you cannot have perturbed he cannot have perturbed we cannot have perturbed you cannot have perturbed they cannot have perturbed	I cannot have been perturbing you cannot have been perturbing he cannot have been perturbing we cannot have been perturbing you cannot have been perturbing they cannot have been perturbing

Interrogative form

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

Interro-negative form

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