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 can't suffer you can't suffer he can't suffer we can't suffer you can't suffer they can't suffer	I can't be suffering you can't be suffering he can't be suffering we can't be suffering you can't be suffering they can't be suffering
Perfect	V-ing perfect
I can't have suffered you can't have suffered he can't have suffered we can't have suffered you can't have suffered they can't have suffered	I can't have been suffering you can't have been suffering he can't have been suffering we can't have been suffering you can't have been suffering they can't 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't I suffer? can't you suffer? can't he suffer? can't we suffer? can't you suffer? can't they suffer?	can't I be suffering? can't you be suffering? can't he be suffering? can't we be suffering? can't you be suffering? can't they be suffering?
Perfect	V-ing perfect
can't I have suffered? can't you have suffered? can't he have suffered? can't we have suffered? can't you have suffered? can't they have suffered?	can't I have been suffering? can't you have been suffering? can't he have been suffering? can't we have been suffering? can't you have been suffering? can't they have been suffering?