must interpolate
Regular verb: interpolate - interpolated- interpolated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must interpolate
you must interpolate
he must interpolate
we must interpolate
you must interpolate
they must interpolate 	I must be interpolating
you must be interpolating
he must be interpolating
we must be interpolating
you must be interpolating
they must be interpolating	I must have interpolated
you must have interpolated
he must have interpolated
we must have interpolated
you must have interpolated
they must have interpolated	I must have been interpolating
you must have been interpolating
he must have been interpolating
we must have been interpolating
you must have been interpolating
they must have been interpolating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not interpolate
you must not interpolate
he must not interpolate
we must not interpolate
you must not interpolate
they must not interpolate 	I must not be interpolating
you must not be interpolating
he must not be interpolating
we must not be interpolating
you must not be interpolating
they must not be interpolating	I must not have interpolated
you must not have interpolated
he must not have interpolated
we must not have interpolated
you must not have interpolated
they must not have interpolated	I must not have been interpolating
you must not have been interpolating
he must not have been interpolating
we must not have been interpolating
you must not have been interpolating
they must not have been interpolating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I interpolate?
must you interpolate?
must he interpolate?
must we interpolate?
must you interpolate?
must they interpolate? 	must I be interpolating?
must you be interpolating?
must he be interpolating?
must we be interpolating?
must you be interpolating?
must they be interpolating? 	must I have interpolated?
must you have interpolated?
must he have interpolated?
must we have interpolated?
must you have interpolated?
must they have interpolated? 	must I have been interpolating?
must you have been interpolating?
must he have been interpolating?
must we have been interpolating?
must you have been interpolating?
must they have been interpolating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not interpolate?
must you not interpolate?
must he not interpolate?
must we not interpolate?
must you not interpolate?
must they not interpolate? 	must I not be interpolating?
must you not be interpolating?
must he not be interpolating?
must we not be interpolating?
must you not be interpolating?
must they not be interpolating? 	must I not have interpolated?
must you not have interpolated?
must he not have interpolated?
must we not have interpolated?
must you not have interpolated?
must they not have interpolated? 	must I not have been interpolating?
must you not have been interpolating?
must he not have been interpolating?
must we not have been interpolating?
must you not have been interpolating?
must they not have been interpolating?