could empoison
Regular verb: empoison - empoisoned- empoisoned

Affirmation 	
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I could empoison
you could empoison
he could empoison
we could empoison
you could empoison
they could empoison 	I could be empoisoning
you could be empoisoning
he could be empoisoning
we could be empoisoning
you could be empoisoning
they could be empoisoning	I could have empoisoned
you could have empoisoned
he could have empoisoned
we could have empoisoned
you could have empoisoned
they could have empoisoned	I could have been empoisoning
you could have been empoisoning
he could have been empoisoning
we could have been empoisoning
you could have been empoisoning
they could have been empoisoning	

Negation 	
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I couldn't empoison
you couldn't empoison
he couldn't empoison
we couldn't empoison
you couldn't empoison
they couldn't empoison 	I couldn't be empoisoning
you couldn't be empoisoning
he couldn't be empoisoning
we couldn't be empoisoning
you couldn't be empoisoning
they couldn't be empoisoning	I couldn't have empoisoned
you couldn't have empoisoned
he couldn't have empoisoned
we couldn't have empoisoned
you couldn't have empoisoned
they couldn't have empoisoned	I couldn't have been empoisoning
you couldn't have been empoisoning
he couldn't have been empoisoning
we couldn't have been empoisoning
you couldn't have been empoisoning
they couldn't have been empoisoning	

Interrogative form 	
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could I empoison?
could you empoison?
could he empoison?
could we empoison?
could you empoison?
could they empoison? 	could I be empoisoning?
could you be empoisoning?
could he be empoisoning?
could we be empoisoning?
could you be empoisoning?
could they be empoisoning? 	could I have empoisoned?
could you have empoisoned?
could he have empoisoned?
could we have empoisoned?
could you have empoisoned?
could they have empoisoned? 	could I have been empoisoning?
could you have been empoisoning?
could he have been empoisoning?
could we have been empoisoning?
could you have been empoisoning?
could they have been empoisoning? 	

Interro-negative form 	
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couldn't I empoison?
couldn't you empoison?
couldn't he empoison?
couldn't we empoison?
couldn't you empoison?
couldn't they empoison? 	couldn't I be empoisoning?
couldn't you be empoisoning?
couldn't he be empoisoning?
couldn't we be empoisoning?
couldn't you be empoisoning?
couldn't they be empoisoning? 	couldn't I have empoisoned?
couldn't you have empoisoned?
couldn't he have empoisoned?
couldn't we have empoisoned?
couldn't you have empoisoned?
couldn't they have empoisoned? 	couldn't I have been empoisoning?
couldn't you have been empoisoning?
couldn't he have been empoisoning?
couldn't we have been empoisoning?
couldn't you have been empoisoning?
couldn't they have been empoisoning?