English verb conjugation
MUST PLANK

Regular verb: plank - planked - planked

Affirmation

Simple form	V-ing form
I must plank you must plank she must plank we must plank you must plank they must plank	I must be planking you must be planking she must be planking we must be planking you must be planking they must be planking
Perfect	V-ing perfect
I must have planked you must have planked she must have planked we must have planked you must have planked they must have planked	I must have been planking you must have been planking she must have been planking we must have been planking you must have been planking they must have been planking

Negation

Simple form	V-ing form
I mustn't plank you mustn't plank she mustn't plank we mustn't plank you mustn't plank they mustn't plank	I mustn't be planking you mustn't be planking she mustn't be planking we mustn't be planking you mustn't be planking they mustn't be planking
Perfect	V-ing perfect
I mustn't have planked you mustn't have planked she mustn't have planked we mustn't have planked you mustn't have planked they mustn't have planked	I mustn't have been planking you mustn't have been planking she mustn't have been planking we mustn't have been planking you mustn't have been planking they mustn't have been planking

Interrogative form

Simple form	V-ing form
must I plank? must you plank? must she plank? must we plank? must you plank? must they plank?	must I be planking? must you be planking? must she be planking? must we be planking? must you be planking? must they be planking?
Perfect	V-ing perfect
must I have planked? must you have planked? must she have planked? must we have planked? must you have planked? must they have planked?	must I have been planking? must you have been planking? must she have been planking? must we have been planking? must you have been planking? must they have been planking?

Interro-negative form

Simple form	V-ing form
mustn't I plank? mustn't you plank? mustn't she plank? mustn't we plank? mustn't you plank? mustn't they plank?	mustn't I be planking? mustn't you be planking? mustn't she be planking? mustn't we be planking? mustn't you be planking? mustn't they be planking?
Perfect	V-ing perfect
mustn't I have planked? mustn't you have planked? mustn't she have planked? mustn't we have planked? mustn't you have planked? mustn't they have planked?	mustn't I have been planking? mustn't you have been planking? mustn't she have been planking? mustn't we have been planking? mustn't you have been planking? mustn't they have been planking?