English verb conjugation
MUST DECK

Regular verb: deck - decked - decked

Affirmation

Simple form	V-ing form
I must deck you must deck he must deck we must deck you must deck they must deck	I must be decking you must be decking he must be decking we must be decking you must be decking they must be decking
Perfect	V-ing perfect
I must have decked you must have decked he must have decked we must have decked you must have decked they must have decked	I must have been decking you must have been decking he must have been decking we must have been decking you must have been decking they must have been decking

Negation

Simple form	V-ing form
I mustn't deck you mustn't deck he mustn't deck we mustn't deck you mustn't deck they mustn't deck	I mustn't be decking you mustn't be decking he mustn't be decking we mustn't be decking you mustn't be decking they mustn't be decking
Perfect	V-ing perfect
I mustn't have decked you mustn't have decked he mustn't have decked we mustn't have decked you mustn't have decked they mustn't have decked	I mustn't have been decking you mustn't have been decking he mustn't have been decking we mustn't have been decking you mustn't have been decking they mustn't have been decking

Interrogative form

Simple form	V-ing form
must I deck? must you deck? must he deck? must we deck? must you deck? must they deck?	must I be decking? must you be decking? must he be decking? must we be decking? must you be decking? must they be decking?
Perfect	V-ing perfect
must I have decked? must you have decked? must he have decked? must we have decked? must you have decked? must they have decked?	must I have been decking? must you have been decking? must he have been decking? must we have been decking? must you have been decking? must they have been decking?

Interro-negative form

Simple form	V-ing form
mustn't I deck? mustn't you deck? mustn't he deck? mustn't we deck? mustn't you deck? mustn't they deck?	mustn't I be decking? mustn't you be decking? mustn't he be decking? mustn't we be decking? mustn't you be decking? mustn't they be decking?
Perfect	V-ing perfect
mustn't I have decked? mustn't you have decked? mustn't he have decked? mustn't we have decked? mustn't you have decked? mustn't they have decked?	mustn't I have been decking? mustn't you have been decking? mustn't he have been decking? mustn't we have been decking? mustn't you have been decking? mustn't they have been decking?