I must attend you must attend she must attend we must attend you must attend they must attend
V-ing form
I must be attending you must be attending she must be attending we must be attending you must be attending they must be attending
Perfect
I must have attended you must have attended she must have attended we must have attended you must have attended they must have attended
V-ing perfect
I must have been attending you must have been attending she must have been attending we must have been attending you must have been attending they must have been attending
Negation
Simple form
I must not attend you must not attend she must not attend we must not attend you must not attend they must not attend
V-ing form
I must not be attending you must not be attending she must not be attending we must not be attending you must not be attending they must not be attending
Perfect
I must not have attended you must not have attended she must not have attended we must not have attended you must not have attended they must not have attended
V-ing perfect
I must not have been attending you must not have been attending she 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
must I attend? must you attend? must she attend? must we attend? must you attend? must they attend?
V-ing form
must I be attending? must you be attending? must she be attending? must we be attending? must you be attending? must they be attending?
Perfect
must I have attended? must you have attended? must she have attended? must we have attended? must you have attended? must they have attended?
V-ing perfect
must I have been attending? must you have been attending? must she have been attending? must we have been attending? must you have been attending? must they have been attending?
Interro-negative form
Simple form
must I not attend? must you not attend? must she not attend? must we not attend? must you not attend? must they not attend?
V-ing form
must I not be attending? must you not be attending? must she not be attending? must we not be attending? must you not be attending? must they not be attending?
Perfect
must I not have attended? must you not have attended? must she not have attended? must we not have attended? must you not have attended? must they not have attended?
V-ing perfect
must I not have been attending? must you not have been attending? must she not have been attending? must we not have been attending? must you not have been attending? must they not have been attending?