could upheave
Regular verb: upheave - upheaved- upheaved

Affirmation 	
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I could upheave
you could upheave
he could upheave
we could upheave
you could upheave
they could upheave 	I could be upheaving
you could be upheaving
he could be upheaving
we could be upheaving
you could be upheaving
they could be upheaving	I could have upheaved
you could have upheaved
he could have upheaved
we could have upheaved
you could have upheaved
they could have upheaved	I could have been upheaving
you could have been upheaving
he could have been upheaving
we could have been upheaving
you could have been upheaving
they could have been upheaving	

Negation 	
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I could not upheave
you could not upheave
he could not upheave
we could not upheave
you could not upheave
they could not upheave 	I could not be upheaving
you could not be upheaving
he could not be upheaving
we could not be upheaving
you could not be upheaving
they could not be upheaving	I could not have upheaved
you could not have upheaved
he could not have upheaved
we could not have upheaved
you could not have upheaved
they could not have upheaved	I could not have been upheaving
you could not have been upheaving
he could not have been upheaving
we could not have been upheaving
you could not have been upheaving
they could not have been upheaving	

Interrogative form 	
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could I upheave?
could you upheave?
could he upheave?
could we upheave?
could you upheave?
could they upheave? 	could I be upheaving?
could you be upheaving?
could he be upheaving?
could we be upheaving?
could you be upheaving?
could they be upheaving? 	could I have upheaved?
could you have upheaved?
could he have upheaved?
could we have upheaved?
could you have upheaved?
could they have upheaved? 	could I have been upheaving?
could you have been upheaving?
could he have been upheaving?
could we have been upheaving?
could you have been upheaving?
could they have been upheaving? 	

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