English verb conjugation
COULD KEY

Regular verb: key - keyed - keyed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?