Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must cover cover you must cover cover she must cover cover we must cover cover you must cover cover they must cover cover
V-ing form
I must be cover covering you must be cover covering she must be cover covering we must be cover covering you must be cover covering they must be cover covering
Perfect
I must have cover covered you must have cover covered she must have cover covered we must have cover covered you must have cover covered they must have cover covered
V-ing perfect
I must have been cover covering you must have been cover covering she must have been cover covering we must have been cover covering you must have been cover covering they must have been cover covering
Negation
Simple form
I mustn't cover cover you mustn't cover cover she mustn't cover cover we mustn't cover cover you mustn't cover cover they mustn't cover cover
V-ing form
I mustn't be cover covering you mustn't be cover covering she mustn't be cover covering we mustn't be cover covering you mustn't be cover covering they mustn't be cover covering
Perfect
I mustn't have cover covered you mustn't have cover covered she mustn't have cover covered we mustn't have cover covered you mustn't have cover covered they mustn't have cover covered
V-ing perfect
I mustn't have been cover covering you mustn't have been cover covering she mustn't have been cover covering we mustn't have been cover covering you mustn't have been cover covering they mustn't have been cover covering
Interrogative form
Simple form
must I cover cover? must you cover cover? must she cover cover? must we cover cover? must you cover cover? must they cover cover?
V-ing form
must I be cover covering? must you be cover covering? must she be cover covering? must we be cover covering? must you be cover covering? must they be cover covering?
Perfect
must I have cover covered? must you have cover covered? must she have cover covered? must we have cover covered? must you have cover covered? must they have cover covered?
V-ing perfect
must I have been cover covering? must you have been cover covering? must she have been cover covering? must we have been cover covering? must you have been cover covering? must they have been cover covering?
Interro-negative form
Simple form
mustn't I cover cover? mustn't you cover cover? mustn't she cover cover? mustn't we cover cover? mustn't you cover cover? mustn't they cover cover?
V-ing form
mustn't I be cover covering? mustn't you be cover covering? mustn't she be cover covering? mustn't we be cover covering? mustn't you be cover covering? mustn't they be cover covering?
Perfect
mustn't I have cover covered? mustn't you have cover covered? mustn't she have cover covered? mustn't we have cover covered? mustn't you have cover covered? mustn't they have cover covered?
V-ing perfect
mustn't I have been cover covering? mustn't you have been cover covering? mustn't she have been cover covering? mustn't we have been cover covering? mustn't you have been cover covering? mustn't they have been cover covering?