English verb conjugation
CAN SUFFER

Regular verb: suffer - suffered - suffered

Affirmation

Simple form	V-ing form
I can suffer you can suffer he can suffer we can suffer you can suffer they can suffer	I can be suffering you can be suffering he can be suffering we can be suffering you can be suffering they can be suffering
Perfect	V-ing perfect
I can have suffered you can have suffered he can have suffered we can have suffered you can have suffered they can have suffered	I can have been suffering you can have been suffering he can have been suffering we can have been suffering you can have been suffering they can have been suffering

Negation

Simple form	V-ing form
I cannot suffer you cannot suffer he cannot suffer we cannot suffer you cannot suffer they cannot suffer	I cannot be suffering you cannot be suffering he cannot be suffering we cannot be suffering you cannot be suffering they cannot be suffering
Perfect	V-ing perfect
I cannot have suffered you cannot have suffered he cannot have suffered we cannot have suffered you cannot have suffered they cannot have suffered	I cannot have been suffering you cannot have been suffering he cannot have been suffering we cannot have been suffering you cannot have been suffering they cannot have been suffering

Interrogative form

Simple form	V-ing form
can I suffer? can you suffer? can he suffer? can we suffer? can you suffer? can they suffer?	can I be suffering? can you be suffering? can he be suffering? can we be suffering? can you be suffering? can they be suffering?
Perfect	V-ing perfect
can I have suffered? can you have suffered? can he have suffered? can we have suffered? can you have suffered? can they have suffered?	can I have been suffering? can you have been suffering? can he have been suffering? can we have been suffering? can you have been suffering? can they have been suffering?

Interro-negative form

Simple form	V-ing form
can I not suffer? can you not suffer? can he not suffer? can we not suffer? can you not suffer? can they not suffer?	can I not be suffering? can you not be suffering? can he not be suffering? can we not be suffering? can you not be suffering? can they not be suffering?
Perfect	V-ing perfect
can I not have suffered? can you not have suffered? can he not have suffered? can we not have suffered? can you not have suffered? can they not have suffered?	can I not have been suffering? can you not have been suffering? can he not have been suffering? can we not have been suffering? can you not have been suffering? can they not have been suffering?