could dogsled
Regular verb: dogsled - dogsleded- dogsleded

Affirmation 	
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I could dogsled
you could dogsled
she could dogsled
we could dogsled
you could dogsled
they could dogsled 	I could be dogsleding
you could be dogsleding
she could be dogsleding
we could be dogsleding
you could be dogsleding
they could be dogsleding	I could have dogsleded
you could have dogsleded
she could have dogsleded
we could have dogsleded
you could have dogsleded
they could have dogsleded	I could have been dogsleding
you could have been dogsleding
she could have been dogsleding
we could have been dogsleding
you could have been dogsleding
they could have been dogsleding	

Negation 	
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I could not dogsled
you could not dogsled
she could not dogsled
we could not dogsled
you could not dogsled
they could not dogsled 	I could not be dogsleding
you could not be dogsleding
she could not be dogsleding
we could not be dogsleding
you could not be dogsleding
they could not be dogsleding	I could not have dogsleded
you could not have dogsleded
she could not have dogsleded
we could not have dogsleded
you could not have dogsleded
they could not have dogsleded	I could not have been dogsleding
you could not have been dogsleding
she could not have been dogsleding
we could not have been dogsleding
you could not have been dogsleding
they could not have been dogsleding	

Interrogative form 	
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could I dogsled?
could you dogsled?
could she dogsled?
could we dogsled?
could you dogsled?
could they dogsled? 	could I be dogsleding?
could you be dogsleding?
could she be dogsleding?
could we be dogsleding?
could you be dogsleding?
could they be dogsleding? 	could I have dogsleded?
could you have dogsleded?
could she have dogsleded?
could we have dogsleded?
could you have dogsleded?
could they have dogsleded? 	could I have been dogsleding?
could you have been dogsleding?
could she have been dogsleding?
could we have been dogsleding?
could you have been dogsleding?
could they have been dogsleding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not dogsled?
could you not dogsled?
could she not dogsled?
could we not dogsled?
could you not dogsled?
could they not dogsled? 	could I not be dogsleding?
could you not be dogsleding?
could she not be dogsleding?
could we not be dogsleding?
could you not be dogsleding?
could they not be dogsleding? 	could I not have dogsleded?
could you not have dogsleded?
could she not have dogsleded?
could we not have dogsleded?
could you not have dogsleded?
could they not have dogsleded? 	could I not have been dogsleding?
could you not have been dogsleding?
could she not have been dogsleding?
could we not have been dogsleding?
could you not have been dogsleding?
could they not have been dogsleding?