could key
Regular verb: key - keyed- keyed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could key
you could key
she could key
we could key
you could key
they could key 	I could be keying
you could be keying
she could be keying
we could be keying
you could be keying
they could be keying	I could have keyed
you could have keyed
she could have keyed
we could have keyed
you could have keyed
they could have keyed	I could have been keying
you could have been keying
she could have been keying
we could have been keying
you could have been keying
they could have been keying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't key
you couldn't key
she couldn't key
we couldn't key
you couldn't key
they couldn't key 	I couldn't be keying
you couldn't be keying
she couldn't be keying
we couldn't be keying
you couldn't be keying
they couldn't be keying	I couldn't have keyed
you couldn't have keyed
she couldn't have keyed
we couldn't have keyed
you couldn't have keyed
they couldn't have keyed	I couldn't have been keying
you couldn't have been keying
she couldn't have been keying
we couldn't have been keying
you couldn't have been keying
they couldn't have been keying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I key?
could you key?
could she key?
could we key?
could you key?
could they key? 	could I be keying?
could you be keying?
could she be keying?
could we be keying?
could you be keying?
could they be keying? 	could I have keyed?
could you have keyed?
could she have keyed?
could we have keyed?
could you have keyed?
could they have keyed? 	could I have been keying?
could you have been keying?
could she have been keying?
could we have been keying?
could you have been keying?
could they have been keying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I key?
couldn't you key?
couldn't she key?
couldn't we key?
couldn't you key?
couldn't they key? 	couldn't I be keying?
couldn't you be keying?
couldn't she be keying?
couldn't we be keying?
couldn't you be keying?
couldn't they be keying? 	couldn't I have keyed?
couldn't you have keyed?
couldn't she have keyed?
couldn't we have keyed?
couldn't you have keyed?
couldn't they have keyed? 	couldn't I have been keying?
couldn't you have been keying?
couldn't she have been keying?
couldn't we have been keying?
couldn't you have been keying?
couldn't they have been keying?