English verb conjugation
CAN GROK

Regular verb: grok - groked - groked

Affirmation

Simple form	V-ing form
I can grok you can grok he can grok we can grok you can grok they can grok	I can be groking you can be groking he can be groking we can be groking you can be groking they can be groking
Perfect	V-ing perfect
I can have groked you can have groked he can have groked we can have groked you can have groked they can have groked	I can have been groking you can have been groking he can have been groking we can have been groking you can have been groking they can have been groking

Negation

Simple form	V-ing form
I can't grok you can't grok he can't grok we can't grok you can't grok they can't grok	I can't be groking you can't be groking he can't be groking we can't be groking you can't be groking they can't be groking
Perfect	V-ing perfect
I can't have groked you can't have groked he can't have groked we can't have groked you can't have groked they can't have groked	I can't have been groking you can't have been groking he can't have been groking we can't have been groking you can't have been groking they can't have been groking

Interrogative form

Simple form	V-ing form
can I grok? can you grok? can he grok? can we grok? can you grok? can they grok?	can I be groking? can you be groking? can he be groking? can we be groking? can you be groking? can they be groking?
Perfect	V-ing perfect
can I have groked? can you have groked? can he have groked? can we have groked? can you have groked? can they have groked?	can I have been groking? can you have been groking? can he have been groking? can we have been groking? can you have been groking? can they have been groking?

Interro-negative form

Simple form	V-ing form
can't I grok? can't you grok? can't he grok? can't we grok? can't you grok? can't they grok?	can't I be groking? can't you be groking? can't he be groking? can't we be groking? can't you be groking? can't they be groking?
Perfect	V-ing perfect
can't I have groked? can't you have groked? can't he have groked? can't we have groked? can't you have groked? can't they have groked?	can't I have been groking? can't you have been groking? can't he have been groking? can't we have been groking? can't you have been groking? can't they have been groking?