could suffer
Regular verb: suffer - suffered- suffered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could suffer
you could suffer
she could suffer
we could suffer
you could suffer
they could suffer 	I could be suffering
you could be suffering
she could be suffering
we could be suffering
you could be suffering
they could be suffering	I could have suffered
you could have suffered
she could have suffered
we could have suffered
you could have suffered
they could have suffered	I could have been suffering
you could have been suffering
she could have been suffering
we could have been suffering
you could have been suffering
they could have been suffering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't suffer
you couldn't suffer
she couldn't suffer
we couldn't suffer
you couldn't suffer
they couldn't suffer 	I couldn't be suffering
you couldn't be suffering
she couldn't be suffering
we couldn't be suffering
you couldn't be suffering
they couldn't be suffering	I couldn't have suffered
you couldn't have suffered
she couldn't have suffered
we couldn't have suffered
you couldn't have suffered
they couldn't have suffered	I couldn't have been suffering
you couldn't have been suffering
she couldn't have been suffering
we couldn't have been suffering
you couldn't have been suffering
they couldn't have been suffering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I suffer?
could you suffer?
could she suffer?
could we suffer?
could you suffer?
could they suffer? 	could I be suffering?
could you be suffering?
could she be suffering?
could we be suffering?
could you be suffering?
could they be suffering? 	could I have suffered?
could you have suffered?
could she have suffered?
could we have suffered?
could you have suffered?
could they have suffered? 	could I have been suffering?
could you have been suffering?
could she have been suffering?
could we have been suffering?
could you have been suffering?
could they have been suffering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I suffer?
couldn't you suffer?
couldn't she suffer?
couldn't we suffer?
couldn't you suffer?
couldn't they suffer? 	couldn't I be suffering?
couldn't you be suffering?
couldn't she be suffering?
couldn't we be suffering?
couldn't you be suffering?
couldn't they be suffering? 	couldn't I have suffered?
couldn't you have suffered?
couldn't she have suffered?
couldn't we have suffered?
couldn't you have suffered?
couldn't they have suffered? 	couldn't I have been suffering?
couldn't you have been suffering?
couldn't she have been suffering?
couldn't we have been suffering?
couldn't you have been suffering?
couldn't they have been suffering?