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 must not attend you must not attend he must not attend we must not attend you must not attend they must not attend	I must not be attending you must not be attending he must not be attending we must not be attending you must not be attending they must not be attending
Perfect	V-ing perfect
I must not have attended you must not have attended he must not have attended we must not have attended you must not have attended they must not have attended	I must not have been attending you must not have been attending he must not have been attending we must not have been attending you must not have been attending they must not 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
must I not attend? must you not attend? must he not attend? must we not attend? must you not attend? must they not attend?	must I not be attending? must you not be attending? must he not be attending? must we not be attending? must you not be attending? must they not be attending?
Perfect	V-ing perfect
must I not have attended? must you not have attended? must he not have attended? must we not have attended? must you not have attended? must they not have attended?	must I not have been attending? must you not have been attending? must he not have been attending? must we not have been attending? must you not have been attending? must they not have been attending?