must aver
Regular verb: aver - averred- averred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must aver
you must aver
she must aver
we must aver
you must aver
they must aver 	I must be averring
you must be averring
she must be averring
we must be averring
you must be averring
they must be averring	I must have averred
you must have averred
she must have averred
we must have averred
you must have averred
they must have averred	I must have been averring
you must have been averring
she must have been averring
we must have been averring
you must have been averring
they must have been averring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not aver
you must not aver
she must not aver
we must not aver
you must not aver
they must not aver 	I must not be averring
you must not be averring
she must not be averring
we must not be averring
you must not be averring
they must not be averring	I must not have averred
you must not have averred
she must not have averred
we must not have averred
you must not have averred
they must not have averred	I must not have been averring
you must not have been averring
she must not have been averring
we must not have been averring
you must not have been averring
they must not have been averring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I aver?
must you aver?
must she aver?
must we aver?
must you aver?
must they aver? 	must I be averring?
must you be averring?
must she be averring?
must we be averring?
must you be averring?
must they be averring? 	must I have averred?
must you have averred?
must she have averred?
must we have averred?
must you have averred?
must they have averred? 	must I have been averring?
must you have been averring?
must she have been averring?
must we have been averring?
must you have been averring?
must they have been averring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not aver?
must you not aver?
must she not aver?
must we not aver?
must you not aver?
must they not aver? 	must I not be averring?
must you not be averring?
must she not be averring?
must we not be averring?
must you not be averring?
must they not be averring? 	must I not have averred?
must you not have averred?
must she not have averred?
must we not have averred?
must you not have averred?
must they not have averred? 	must I not have been averring?
must you not have been averring?
must she not have been averring?
must we not have been averring?
must you not have been averring?
must they not have been averring?