English verb conjugation
CAN PEN

Regular verb: pen - penned - penned

Affirmation

Simple form	V-ing form
I can pen you can pen she can pen we can pen you can pen they can pen	I can be penning you can be penning she can be penning we can be penning you can be penning they can be penning
Perfect	V-ing perfect
I can have penned you can have penned she can have penned we can have penned you can have penned they can have penned	I can have been penning you can have been penning she can have been penning we can have been penning you can have been penning they can have been penning

Negation

Simple form	V-ing form
I can't pen you can't pen she can't pen we can't pen you can't pen they can't pen	I can't be penning you can't be penning she can't be penning we can't be penning you can't be penning they can't be penning
Perfect	V-ing perfect
I can't have penned you can't have penned she can't have penned we can't have penned you can't have penned they can't have penned	I can't have been penning you can't have been penning she can't have been penning we can't have been penning you can't have been penning they can't have been penning

Interrogative form

Simple form	V-ing form
can I pen? can you pen? can she pen? can we pen? can you pen? can they pen?	can I be penning? can you be penning? can she be penning? can we be penning? can you be penning? can they be penning?
Perfect	V-ing perfect
can I have penned? can you have penned? can she have penned? can we have penned? can you have penned? can they have penned?	can I have been penning? can you have been penning? can she have been penning? can we have been penning? can you have been penning? can they have been penning?

Interro-negative form

Simple form	V-ing form
can't I pen? can't you pen? can't she pen? can't we pen? can't you pen? can't they pen?	can't I be penning? can't you be penning? can't she be penning? can't we be penning? can't you be penning? can't they be penning?
Perfect	V-ing perfect
can't I have penned? can't you have penned? can't she have penned? can't we have penned? can't you have penned? can't they have penned?	can't I have been penning? can't you have been penning? can't she have been penning? can't we have been penning? can't you have been penning? can't they have been penning?