must upheave
Regular verb: upheave - upheaved- upheaved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must upheave
you must upheave
she must upheave
we must upheave
you must upheave
they must upheave 	I must be upheaving
you must be upheaving
she must be upheaving
we must be upheaving
you must be upheaving
they must be upheaving	I must have upheaved
you must have upheaved
she must have upheaved
we must have upheaved
you must have upheaved
they must have upheaved	I must have been upheaving
you must have been upheaving
she must have been upheaving
we must have been upheaving
you must have been upheaving
they must have been upheaving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not upheave
you must not upheave
she must not upheave
we must not upheave
you must not upheave
they must not upheave 	I must not be upheaving
you must not be upheaving
she must not be upheaving
we must not be upheaving
you must not be upheaving
they must not be upheaving	I must not have upheaved
you must not have upheaved
she must not have upheaved
we must not have upheaved
you must not have upheaved
they must not have upheaved	I must not have been upheaving
you must not have been upheaving
she must not have been upheaving
we must not have been upheaving
you must not have been upheaving
they must not have been upheaving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I upheave?
must you upheave?
must she upheave?
must we upheave?
must you upheave?
must they upheave? 	must I be upheaving?
must you be upheaving?
must she be upheaving?
must we be upheaving?
must you be upheaving?
must they be upheaving? 	must I have upheaved?
must you have upheaved?
must she have upheaved?
must we have upheaved?
must you have upheaved?
must they have upheaved? 	must I have been upheaving?
must you have been upheaving?
must she have been upheaving?
must we have been upheaving?
must you have been upheaving?
must they have been upheaving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not upheave?
must you not upheave?
must she not upheave?
must we not upheave?
must you not upheave?
must they not upheave? 	must I not be upheaving?
must you not be upheaving?
must she not be upheaving?
must we not be upheaving?
must you not be upheaving?
must they not be upheaving? 	must I not have upheaved?
must you not have upheaved?
must she not have upheaved?
must we not have upheaved?
must you not have upheaved?
must they not have upheaved? 	must I not have been upheaving?
must you not have been upheaving?
must she not have been upheaving?
must we not have been upheaving?
must you not have been upheaving?
must they not have been upheaving?