English verb conjugation
MUST GROK

Regular verb: grok - groked - groked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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