could filibuster
Regular verb: filibuster - filibustered- filibustered

Affirmation 	
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I could filibuster
you could filibuster
she could filibuster
we could filibuster
you could filibuster
they could filibuster 	I could be filibustering
you could be filibustering
she could be filibustering
we could be filibustering
you could be filibustering
they could be filibustering	I could have filibustered
you could have filibustered
she could have filibustered
we could have filibustered
you could have filibustered
they could have filibustered	I could have been filibustering
you could have been filibustering
she could have been filibustering
we could have been filibustering
you could have been filibustering
they could have been filibustering	

Negation 	
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I couldn't filibuster
you couldn't filibuster
she couldn't filibuster
we couldn't filibuster
you couldn't filibuster
they couldn't filibuster 	I couldn't be filibustering
you couldn't be filibustering
she couldn't be filibustering
we couldn't be filibustering
you couldn't be filibustering
they couldn't be filibustering	I couldn't have filibustered
you couldn't have filibustered
she couldn't have filibustered
we couldn't have filibustered
you couldn't have filibustered
they couldn't have filibustered	I couldn't have been filibustering
you couldn't have been filibustering
she couldn't have been filibustering
we couldn't have been filibustering
you couldn't have been filibustering
they couldn't have been filibustering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I filibuster?
could you filibuster?
could she filibuster?
could we filibuster?
could you filibuster?
could they filibuster? 	could I be filibustering?
could you be filibustering?
could she be filibustering?
could we be filibustering?
could you be filibustering?
could they be filibustering? 	could I have filibustered?
could you have filibustered?
could she have filibustered?
could we have filibustered?
could you have filibustered?
could they have filibustered? 	could I have been filibustering?
could you have been filibustering?
could she have been filibustering?
could we have been filibustering?
could you have been filibustering?
could they have been filibustering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I filibuster?
couldn't you filibuster?
couldn't she filibuster?
couldn't we filibuster?
couldn't you filibuster?
couldn't they filibuster? 	couldn't I be filibustering?
couldn't you be filibustering?
couldn't she be filibustering?
couldn't we be filibustering?
couldn't you be filibustering?
couldn't they be filibustering? 	couldn't I have filibustered?
couldn't you have filibustered?
couldn't she have filibustered?
couldn't we have filibustered?
couldn't you have filibustered?
couldn't they have filibustered? 	couldn't I have been filibustering?
couldn't you have been filibustering?
couldn't she have been filibustering?
couldn't we have been filibustering?
couldn't you have been filibustering?
couldn't they have been filibustering?