could heft
Regular verb: heft - hefted- hefted

Affirmation 	
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I could heft
you could heft
he could heft
we could heft
you could heft
they could heft 	I could be hefting
you could be hefting
he could be hefting
we could be hefting
you could be hefting
they could be hefting	I could have hefted
you could have hefted
he could have hefted
we could have hefted
you could have hefted
they could have hefted	I could have been hefting
you could have been hefting
he could have been hefting
we could have been hefting
you could have been hefting
they could have been hefting	

Negation 	
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I couldn't heft
you couldn't heft
he couldn't heft
we couldn't heft
you couldn't heft
they couldn't heft 	I couldn't be hefting
you couldn't be hefting
he couldn't be hefting
we couldn't be hefting
you couldn't be hefting
they couldn't be hefting	I couldn't have hefted
you couldn't have hefted
he couldn't have hefted
we couldn't have hefted
you couldn't have hefted
they couldn't have hefted	I couldn't have been hefting
you couldn't have been hefting
he couldn't have been hefting
we couldn't have been hefting
you couldn't have been hefting
they couldn't have been hefting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I heft?
could you heft?
could he heft?
could we heft?
could you heft?
could they heft? 	could I be hefting?
could you be hefting?
could he be hefting?
could we be hefting?
could you be hefting?
could they be hefting? 	could I have hefted?
could you have hefted?
could he have hefted?
could we have hefted?
could you have hefted?
could they have hefted? 	could I have been hefting?
could you have been hefting?
could he have been hefting?
could we have been hefting?
could you have been hefting?
could they have been hefting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I heft?
couldn't you heft?
couldn't he heft?
couldn't we heft?
couldn't you heft?
couldn't they heft? 	couldn't I be hefting?
couldn't you be hefting?
couldn't he be hefting?
couldn't we be hefting?
couldn't you be hefting?
couldn't they be hefting? 	couldn't I have hefted?
couldn't you have hefted?
couldn't he have hefted?
couldn't we have hefted?
couldn't you have hefted?
couldn't they have hefted? 	couldn't I have been hefting?
couldn't you have been hefting?
couldn't he have been hefting?
couldn't we have been hefting?
couldn't you have been hefting?
couldn't they have been hefting?