English verb conjugation
COULD KEY

Regular verb: key - keyed - keyed

Affirmation

Simple form	V-ing form
I could key you could key he could key we could key you could key they could key	I could be keying you could be keying he 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 he 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 he 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 he 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 he 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 he 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 he 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 he key? could we key? could you key? could they key?	could I be keying? could you be keying? could he 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 he 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 he 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 he 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 he 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 he 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 he have been keying? couldn't we have been keying? couldn't you have been keying? couldn't they have been keying?