English verb conjugation
MUST UNDULATE

Regular verb: undulate - undulated - undulated

Affirmation

Simple form	V-ing form
I must undulate you must undulate he must undulate we must undulate you must undulate they must undulate	I must be undulating you must be undulating he must be undulating we must be undulating you must be undulating they must be undulating
Perfect	V-ing perfect
I must have undulated you must have undulated he must have undulated we must have undulated you must have undulated they must have undulated	I must have been undulating you must have been undulating he must have been undulating we must have been undulating you must have been undulating they must have been undulating

Negation

Simple form	V-ing form
I mustn't undulate you mustn't undulate he mustn't undulate we mustn't undulate you mustn't undulate they mustn't undulate	I mustn't be undulating you mustn't be undulating he mustn't be undulating we mustn't be undulating you mustn't be undulating they mustn't be undulating
Perfect	V-ing perfect
I mustn't have undulated you mustn't have undulated he mustn't have undulated we mustn't have undulated you mustn't have undulated they mustn't have undulated	I mustn't have been undulating you mustn't have been undulating he mustn't have been undulating we mustn't have been undulating you mustn't have been undulating they mustn't have been undulating

Interrogative form

Simple form	V-ing form
must I undulate? must you undulate? must he undulate? must we undulate? must you undulate? must they undulate?	must I be undulating? must you be undulating? must he be undulating? must we be undulating? must you be undulating? must they be undulating?
Perfect	V-ing perfect
must I have undulated? must you have undulated? must he have undulated? must we have undulated? must you have undulated? must they have undulated?	must I have been undulating? must you have been undulating? must he have been undulating? must we have been undulating? must you have been undulating? must they have been undulating?

Interro-negative form

Simple form	V-ing form
mustn't I undulate? mustn't you undulate? mustn't he undulate? mustn't we undulate? mustn't you undulate? mustn't they undulate?	mustn't I be undulating? mustn't you be undulating? mustn't he be undulating? mustn't we be undulating? mustn't you be undulating? mustn't they be undulating?
Perfect	V-ing perfect
mustn't I have undulated? mustn't you have undulated? mustn't he have undulated? mustn't we have undulated? mustn't you have undulated? mustn't they have undulated?	mustn't I have been undulating? mustn't you have been undulating? mustn't he have been undulating? mustn't we have been undulating? mustn't you have been undulating? mustn't they have been undulating?