could breakfast
Regular verb: breakfast - breakfasted- breakfasted

Affirmation 	
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I could breakfast
you could breakfast
she could breakfast
we could breakfast
you could breakfast
they could breakfast 	I could be breakfasting
you could be breakfasting
she could be breakfasting
we could be breakfasting
you could be breakfasting
they could be breakfasting	I could have breakfasted
you could have breakfasted
she could have breakfasted
we could have breakfasted
you could have breakfasted
they could have breakfasted	I could have been breakfasting
you could have been breakfasting
she could have been breakfasting
we could have been breakfasting
you could have been breakfasting
they could have been breakfasting	

Negation 	
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I could not breakfast
you could not breakfast
she could not breakfast
we could not breakfast
you could not breakfast
they could not breakfast 	I could not be breakfasting
you could not be breakfasting
she could not be breakfasting
we could not be breakfasting
you could not be breakfasting
they could not be breakfasting	I could not have breakfasted
you could not have breakfasted
she could not have breakfasted
we could not have breakfasted
you could not have breakfasted
they could not have breakfasted	I could not have been breakfasting
you could not have been breakfasting
she could not have been breakfasting
we could not have been breakfasting
you could not have been breakfasting
they could not have been breakfasting	

Interrogative form 	
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could I breakfast?
could you breakfast?
could she breakfast?
could we breakfast?
could you breakfast?
could they breakfast? 	could I be breakfasting?
could you be breakfasting?
could she be breakfasting?
could we be breakfasting?
could you be breakfasting?
could they be breakfasting? 	could I have breakfasted?
could you have breakfasted?
could she have breakfasted?
could we have breakfasted?
could you have breakfasted?
could they have breakfasted? 	could I have been breakfasting?
could you have been breakfasting?
could she have been breakfasting?
could we have been breakfasting?
could you have been breakfasting?
could they have been breakfasting? 	

Interro-negative form 	
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could I not breakfast?
could you not breakfast?
could she not breakfast?
could we not breakfast?
could you not breakfast?
could they not breakfast? 	could I not be breakfasting?
could you not be breakfasting?
could she not be breakfasting?
could we not be breakfasting?
could you not be breakfasting?
could they not be breakfasting? 	could I not have breakfasted?
could you not have breakfasted?
could she not have breakfasted?
could we not have breakfasted?
could you not have breakfasted?
could they not have breakfasted? 	could I not have been breakfasting?
could you not have been breakfasting?
could she not have been breakfasting?
could we not have been breakfasting?
could you not have been breakfasting?
could they not have been breakfasting?