must extrapolate
Regular verb: extrapolate - extrapolated- extrapolated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must extrapolate
you must extrapolate
he must extrapolate
we must extrapolate
you must extrapolate
they must extrapolate 	I must be extrapolating
you must be extrapolating
he must be extrapolating
we must be extrapolating
you must be extrapolating
they must be extrapolating	I must have extrapolated
you must have extrapolated
he must have extrapolated
we must have extrapolated
you must have extrapolated
they must have extrapolated	I must have been extrapolating
you must have been extrapolating
he must have been extrapolating
we must have been extrapolating
you must have been extrapolating
they must have been extrapolating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not extrapolate
you must not extrapolate
he must not extrapolate
we must not extrapolate
you must not extrapolate
they must not extrapolate 	I must not be extrapolating
you must not be extrapolating
he must not be extrapolating
we must not be extrapolating
you must not be extrapolating
they must not be extrapolating	I must not have extrapolated
you must not have extrapolated
he must not have extrapolated
we must not have extrapolated
you must not have extrapolated
they must not have extrapolated	I must not have been extrapolating
you must not have been extrapolating
he must not have been extrapolating
we must not have been extrapolating
you must not have been extrapolating
they must not have been extrapolating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I extrapolate?
must you extrapolate?
must he extrapolate?
must we extrapolate?
must you extrapolate?
must they extrapolate? 	must I be extrapolating?
must you be extrapolating?
must he be extrapolating?
must we be extrapolating?
must you be extrapolating?
must they be extrapolating? 	must I have extrapolated?
must you have extrapolated?
must he have extrapolated?
must we have extrapolated?
must you have extrapolated?
must they have extrapolated? 	must I have been extrapolating?
must you have been extrapolating?
must he have been extrapolating?
must we have been extrapolating?
must you have been extrapolating?
must they have been extrapolating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not extrapolate?
must you not extrapolate?
must he not extrapolate?
must we not extrapolate?
must you not extrapolate?
must they not extrapolate? 	must I not be extrapolating?
must you not be extrapolating?
must he not be extrapolating?
must we not be extrapolating?
must you not be extrapolating?
must they not be extrapolating? 	must I not have extrapolated?
must you not have extrapolated?
must he not have extrapolated?
must we not have extrapolated?
must you not have extrapolated?
must they not have extrapolated? 	must I not have been extrapolating?
must you not have been extrapolating?
must he not have been extrapolating?
must we not have been extrapolating?
must you not have been extrapolating?
must they not have been extrapolating?