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 cannot grok you cannot grok he cannot grok we cannot grok you cannot grok they cannot grok	I cannot be groking you cannot be groking he cannot be groking we cannot be groking you cannot be groking they cannot be groking
Perfect	V-ing perfect
I cannot have groked you cannot have groked he cannot have groked we cannot have groked you cannot have groked they cannot have groked	I cannot have been groking you cannot have been groking he cannot have been groking we cannot have been groking you cannot have been groking they cannot 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 I not grok? can you not grok? can he not grok? can we not grok? can you not grok? can they not grok?	can I not be groking? can you not be groking? can he not be groking? can we not be groking? can you not be groking? can they not be groking?
Perfect	V-ing perfect
can I not have groked? can you not have groked? can he not have groked? can we not have groked? can you not have groked? can they not have groked?	can I not have been groking? can you not have been groking? can he not have been groking? can we not have been groking? can you not have been groking? can they not have been groking?