must accumulate
Regular verb: accumulate - accumulated- accumulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must accumulate
you must accumulate
he must accumulate
we must accumulate
you must accumulate
they must accumulate 	I must be accumulating
you must be accumulating
he must be accumulating
we must be accumulating
you must be accumulating
they must be accumulating	I must have accumulated
you must have accumulated
he must have accumulated
we must have accumulated
you must have accumulated
they must have accumulated	I must have been accumulating
you must have been accumulating
he must have been accumulating
we must have been accumulating
you must have been accumulating
they must have been accumulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not accumulate
you must not accumulate
he must not accumulate
we must not accumulate
you must not accumulate
they must not accumulate 	I must not be accumulating
you must not be accumulating
he must not be accumulating
we must not be accumulating
you must not be accumulating
they must not be accumulating	I must not have accumulated
you must not have accumulated
he must not have accumulated
we must not have accumulated
you must not have accumulated
they must not have accumulated	I must not have been accumulating
you must not have been accumulating
he must not have been accumulating
we must not have been accumulating
you must not have been accumulating
they must not have been accumulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I accumulate?
must you accumulate?
must he accumulate?
must we accumulate?
must you accumulate?
must they accumulate? 	must I be accumulating?
must you be accumulating?
must he be accumulating?
must we be accumulating?
must you be accumulating?
must they be accumulating? 	must I have accumulated?
must you have accumulated?
must he have accumulated?
must we have accumulated?
must you have accumulated?
must they have accumulated? 	must I have been accumulating?
must you have been accumulating?
must he have been accumulating?
must we have been accumulating?
must you have been accumulating?
must they have been accumulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not accumulate?
must you not accumulate?
must he not accumulate?
must we not accumulate?
must you not accumulate?
must they not accumulate? 	must I not be accumulating?
must you not be accumulating?
must he not be accumulating?
must we not be accumulating?
must you not be accumulating?
must they not be accumulating? 	must I not have accumulated?
must you not have accumulated?
must he not have accumulated?
must we not have accumulated?
must you not have accumulated?
must they not have accumulated? 	must I not have been accumulating?
must you not have been accumulating?
must he not have been accumulating?
must we not have been accumulating?
must you not have been accumulating?
must they not have been accumulating?