English verb conjugation
MUST ATTEND

Regular verb: attend - attended - attended

Affirmation

Simple form	V-ing form
I must attend you must attend he must attend we must attend you must attend they must attend	I must be attending you must be attending he must be attending we must be attending you must be attending they must be attending
Perfect	V-ing perfect
I must have attended you must have attended he must have attended we must have attended you must have attended they must have attended	I must have been attending you must have been attending he must have been attending we must have been attending you must have been attending they must have been attending

Negation

Simple form	V-ing form
I mustn't attend you mustn't attend he mustn't attend we mustn't attend you mustn't attend they mustn't attend	I mustn't be attending you mustn't be attending he mustn't be attending we mustn't be attending you mustn't be attending they mustn't be attending
Perfect	V-ing perfect
I mustn't have attended you mustn't have attended he mustn't have attended we mustn't have attended you mustn't have attended they mustn't have attended	I mustn't have been attending you mustn't have been attending he mustn't have been attending we mustn't have been attending you mustn't have been attending they mustn't have been attending

Interrogative form

Simple form	V-ing form
must I attend? must you attend? must he attend? must we attend? must you attend? must they attend?	must I be attending? must you be attending? must he be attending? must we be attending? must you be attending? must they be attending?
Perfect	V-ing perfect
must I have attended? must you have attended? must he have attended? must we have attended? must you have attended? must they have attended?	must I have been attending? must you have been attending? must he have been attending? must we have been attending? must you have been attending? must they have been attending?

Interro-negative form

Simple form	V-ing form
mustn't I attend? mustn't you attend? mustn't he attend? mustn't we attend? mustn't you attend? mustn't they attend?	mustn't I be attending? mustn't you be attending? mustn't he be attending? mustn't we be attending? mustn't you be attending? mustn't they be attending?
Perfect	V-ing perfect
mustn't I have attended? mustn't you have attended? mustn't he have attended? mustn't we have attended? mustn't you have attended? mustn't they have attended?	mustn't I have been attending? mustn't you have been attending? mustn't he have been attending? mustn't we have been attending? mustn't you have been attending? mustn't they have been attending?