could pain
Regular verb: pain - pained- pained

Affirmation 	
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I could pain
you could pain
he could pain
we could pain
you could pain
they could pain 	I could be paining
you could be paining
he could be paining
we could be paining
you could be paining
they could be paining	I could have pained
you could have pained
he could have pained
we could have pained
you could have pained
they could have pained	I could have been paining
you could have been paining
he could have been paining
we could have been paining
you could have been paining
they could have been paining	

Negation 	
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I couldn't pain
you couldn't pain
he couldn't pain
we couldn't pain
you couldn't pain
they couldn't pain 	I couldn't be paining
you couldn't be paining
he couldn't be paining
we couldn't be paining
you couldn't be paining
they couldn't be paining	I couldn't have pained
you couldn't have pained
he couldn't have pained
we couldn't have pained
you couldn't have pained
they couldn't have pained	I couldn't have been paining
you couldn't have been paining
he couldn't have been paining
we couldn't have been paining
you couldn't have been paining
they couldn't have been paining	

Interrogative form 	
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could I pain?
could you pain?
could he pain?
could we pain?
could you pain?
could they pain? 	could I be paining?
could you be paining?
could he be paining?
could we be paining?
could you be paining?
could they be paining? 	could I have pained?
could you have pained?
could he have pained?
could we have pained?
could you have pained?
could they have pained? 	could I have been paining?
could you have been paining?
could he have been paining?
could we have been paining?
could you have been paining?
could they have been paining? 	

Interro-negative form 	
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couldn't I pain?
couldn't you pain?
couldn't he pain?
couldn't we pain?
couldn't you pain?
couldn't they pain? 	couldn't I be paining?
couldn't you be paining?
couldn't he be paining?
couldn't we be paining?
couldn't you be paining?
couldn't they be paining? 	couldn't I have pained?
couldn't you have pained?
couldn't he have pained?
couldn't we have pained?
couldn't you have pained?
couldn't they have pained? 	couldn't I have been paining?
couldn't you have been paining?
couldn't he have been paining?
couldn't we have been paining?
couldn't you have been paining?
couldn't they have been paining?