must calculate
Regular verb: calculate - calculated- calculated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must calculate
you must calculate
she must calculate
we must calculate
you must calculate
they must calculate 	I must be calculating
you must be calculating
she must be calculating
we must be calculating
you must be calculating
they must be calculating	I must have calculated
you must have calculated
she must have calculated
we must have calculated
you must have calculated
they must have calculated	I must have been calculating
you must have been calculating
she must have been calculating
we must have been calculating
you must have been calculating
they must have been calculating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not calculate
you must not calculate
she must not calculate
we must not calculate
you must not calculate
they must not calculate 	I must not be calculating
you must not be calculating
she must not be calculating
we must not be calculating
you must not be calculating
they must not be calculating	I must not have calculated
you must not have calculated
she must not have calculated
we must not have calculated
you must not have calculated
they must not have calculated	I must not have been calculating
you must not have been calculating
she must not have been calculating
we must not have been calculating
you must not have been calculating
they must not have been calculating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I calculate?
must you calculate?
must she calculate?
must we calculate?
must you calculate?
must they calculate? 	must I be calculating?
must you be calculating?
must she be calculating?
must we be calculating?
must you be calculating?
must they be calculating? 	must I have calculated?
must you have calculated?
must she have calculated?
must we have calculated?
must you have calculated?
must they have calculated? 	must I have been calculating?
must you have been calculating?
must she have been calculating?
must we have been calculating?
must you have been calculating?
must they have been calculating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not calculate?
must you not calculate?
must she not calculate?
must we not calculate?
must you not calculate?
must they not calculate? 	must I not be calculating?
must you not be calculating?
must she not be calculating?
must we not be calculating?
must you not be calculating?
must they not be calculating? 	must I not have calculated?
must you not have calculated?
must she not have calculated?
must we not have calculated?
must you not have calculated?
must they not have calculated? 	must I not have been calculating?
must you not have been calculating?
must she not have been calculating?
must we not have been calculating?
must you not have been calculating?
must they not have been calculating?