could correspond
Regular verb: correspond - corresponded- corresponded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could correspond
you could correspond
she could correspond
we could correspond
you could correspond
they could correspond 	I could be corresponding
you could be corresponding
she could be corresponding
we could be corresponding
you could be corresponding
they could be corresponding	I could have corresponded
you could have corresponded
she could have corresponded
we could have corresponded
you could have corresponded
they could have corresponded	I could have been corresponding
you could have been corresponding
she could have been corresponding
we could have been corresponding
you could have been corresponding
they could have been corresponding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't correspond
you couldn't correspond
she couldn't correspond
we couldn't correspond
you couldn't correspond
they couldn't correspond 	I couldn't be corresponding
you couldn't be corresponding
she couldn't be corresponding
we couldn't be corresponding
you couldn't be corresponding
they couldn't be corresponding	I couldn't have corresponded
you couldn't have corresponded
she couldn't have corresponded
we couldn't have corresponded
you couldn't have corresponded
they couldn't have corresponded	I couldn't have been corresponding
you couldn't have been corresponding
she couldn't have been corresponding
we couldn't have been corresponding
you couldn't have been corresponding
they couldn't have been corresponding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I correspond?
could you correspond?
could she correspond?
could we correspond?
could you correspond?
could they correspond? 	could I be corresponding?
could you be corresponding?
could she be corresponding?
could we be corresponding?
could you be corresponding?
could they be corresponding? 	could I have corresponded?
could you have corresponded?
could she have corresponded?
could we have corresponded?
could you have corresponded?
could they have corresponded? 	could I have been corresponding?
could you have been corresponding?
could she have been corresponding?
could we have been corresponding?
could you have been corresponding?
could they have been corresponding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I correspond?
couldn't you correspond?
couldn't she correspond?
couldn't we correspond?
couldn't you correspond?
couldn't they correspond? 	couldn't I be corresponding?
couldn't you be corresponding?
couldn't she be corresponding?
couldn't we be corresponding?
couldn't you be corresponding?
couldn't they be corresponding? 	couldn't I have corresponded?
couldn't you have corresponded?
couldn't she have corresponded?
couldn't we have corresponded?
couldn't you have corresponded?
couldn't they have corresponded? 	couldn't I have been corresponding?
couldn't you have been corresponding?
couldn't she have been corresponding?
couldn't we have been corresponding?
couldn't you have been corresponding?
couldn't they have been corresponding?