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 must not cover you must not cover he must not cover we must not cover you must not cover they must not cover	I must not be covering you must not be covering he must not be covering we must not be covering you must not be covering they must not be covering
Perfect	V-ing perfect
I must not have covered you must not have covered he must not have covered we must not have covered you must not have covered they must not have covered	I must not have been covering you must not have been covering he must not have been covering we must not have been covering you must not have been covering they must not 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
must I not cover? must you not cover? must he not cover? must we not cover? must you not cover? must they not cover?	must I not be covering? must you not be covering? must he not be covering? must we not be covering? must you not be covering? must they not be covering?
Perfect	V-ing perfect
must I not have covered? must you not have covered? must he not have covered? must we not have covered? must you not have covered? must they not have covered?	must I not have been covering? must you not have been covering? must he not have been covering? must we not have been covering? must you not have been covering? must they not have been covering?