English verb conjugation
MUST COVER

Regular verb: cover - covered - covered

Affirmation

Simple form	V-ing form
I must cover you must cover he must cover we must cover you must cover they must cover	I must be covering you must be covering he must be covering we must be covering you must be covering they must be covering
Perfect	V-ing perfect
I must have covered you must have covered he must have covered we must have covered you must have covered they must have covered	I must have been covering you must have been covering he must have been covering we must have been covering you must have been covering they must have been covering

Negation

Simple form	V-ing form
I mustn't cover you mustn't cover he mustn't cover we mustn't cover you mustn't cover they mustn't cover	I mustn't be covering you mustn't be covering he mustn't be covering we mustn't be covering you mustn't be covering they mustn't be covering
Perfect	V-ing perfect
I mustn't have covered you mustn't have covered he mustn't have covered we mustn't have covered you mustn't have covered they mustn't have covered	I mustn't have been covering you mustn't have been covering he mustn't have been covering we mustn't have been covering you mustn't have been covering they mustn't have been covering

Interrogative form

Simple form	V-ing form
must I cover? must you cover? must he cover? must we cover? must you cover? must they cover?	must I be covering? must you be covering? must he be covering? must we be covering? must you be covering? must they be covering?
Perfect	V-ing perfect
must I have covered? must you have covered? must he have covered? must we have covered? must you have covered? must they have covered?	must I have been covering? must you have been covering? must he have been covering? must we have been covering? must you have been covering? must they have been covering?

Interro-negative form

Simple form	V-ing form
mustn't I cover? mustn't you cover? mustn't he cover? mustn't we cover? mustn't you cover? mustn't they cover?	mustn't I be covering? mustn't you be covering? mustn't he be covering? mustn't we be covering? mustn't you be covering? mustn't they be covering?
Perfect	V-ing perfect
mustn't I have covered? mustn't you have covered? mustn't he have covered? mustn't we have covered? mustn't you have covered? mustn't they have covered?	mustn't I have been covering? mustn't you have been covering? mustn't he have been covering? mustn't we have been covering? mustn't you have been covering? mustn't they have been covering?