must attend
Regular verb: attend - attended- attended

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