could vociferate
Regular verb: vociferate - vociferated- vociferated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vociferate
you could vociferate
he could vociferate
we could vociferate
you could vociferate
they could vociferate 	I could be vociferating
you could be vociferating
he could be vociferating
we could be vociferating
you could be vociferating
they could be vociferating	I could have vociferated
you could have vociferated
he could have vociferated
we could have vociferated
you could have vociferated
they could have vociferated	I could have been vociferating
you could have been vociferating
he could have been vociferating
we could have been vociferating
you could have been vociferating
they could have been vociferating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't vociferate
you couldn't vociferate
he couldn't vociferate
we couldn't vociferate
you couldn't vociferate
they couldn't vociferate 	I couldn't be vociferating
you couldn't be vociferating
he couldn't be vociferating
we couldn't be vociferating
you couldn't be vociferating
they couldn't be vociferating	I couldn't have vociferated
you couldn't have vociferated
he couldn't have vociferated
we couldn't have vociferated
you couldn't have vociferated
they couldn't have vociferated	I couldn't have been vociferating
you couldn't have been vociferating
he couldn't have been vociferating
we couldn't have been vociferating
you couldn't have been vociferating
they couldn't have been vociferating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vociferate?
could you vociferate?
could he vociferate?
could we vociferate?
could you vociferate?
could they vociferate? 	could I be vociferating?
could you be vociferating?
could he be vociferating?
could we be vociferating?
could you be vociferating?
could they be vociferating? 	could I have vociferated?
could you have vociferated?
could he have vociferated?
could we have vociferated?
could you have vociferated?
could they have vociferated? 	could I have been vociferating?
could you have been vociferating?
could he have been vociferating?
could we have been vociferating?
could you have been vociferating?
could they have been vociferating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I vociferate?
couldn't you vociferate?
couldn't he vociferate?
couldn't we vociferate?
couldn't you vociferate?
couldn't they vociferate? 	couldn't I be vociferating?
couldn't you be vociferating?
couldn't he be vociferating?
couldn't we be vociferating?
couldn't you be vociferating?
couldn't they be vociferating? 	couldn't I have vociferated?
couldn't you have vociferated?
couldn't he have vociferated?
couldn't we have vociferated?
couldn't you have vociferated?
couldn't they have vociferated? 	couldn't I have been vociferating?
couldn't you have been vociferating?
couldn't he have been vociferating?
couldn't we have been vociferating?
couldn't you have been vociferating?
couldn't they have been vociferating?