could scream
Regular verb: scream - screamed- screamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scream
you could scream
he could scream
we could scream
you could scream
they could scream 	I could be screaming
you could be screaming
he could be screaming
we could be screaming
you could be screaming
they could be screaming	I could have screamed
you could have screamed
he could have screamed
we could have screamed
you could have screamed
they could have screamed	I could have been screaming
you could have been screaming
he could have been screaming
we could have been screaming
you could have been screaming
they could have been screaming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't scream
you couldn't scream
he couldn't scream
we couldn't scream
you couldn't scream
they couldn't scream 	I couldn't be screaming
you couldn't be screaming
he couldn't be screaming
we couldn't be screaming
you couldn't be screaming
they couldn't be screaming	I couldn't have screamed
you couldn't have screamed
he couldn't have screamed
we couldn't have screamed
you couldn't have screamed
they couldn't have screamed	I couldn't have been screaming
you couldn't have been screaming
he couldn't have been screaming
we couldn't have been screaming
you couldn't have been screaming
they couldn't have been screaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scream?
could you scream?
could he scream?
could we scream?
could you scream?
could they scream? 	could I be screaming?
could you be screaming?
could he be screaming?
could we be screaming?
could you be screaming?
could they be screaming? 	could I have screamed?
could you have screamed?
could he have screamed?
could we have screamed?
could you have screamed?
could they have screamed? 	could I have been screaming?
could you have been screaming?
could he have been screaming?
could we have been screaming?
could you have been screaming?
could they have been screaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I scream?
couldn't you scream?
couldn't he scream?
couldn't we scream?
couldn't you scream?
couldn't they scream? 	couldn't I be screaming?
couldn't you be screaming?
couldn't he be screaming?
couldn't we be screaming?
couldn't you be screaming?
couldn't they be screaming? 	couldn't I have screamed?
couldn't you have screamed?
couldn't he have screamed?
couldn't we have screamed?
couldn't you have screamed?
couldn't they have screamed? 	couldn't I have been screaming?
couldn't you have been screaming?
couldn't he have been screaming?
couldn't we have been screaming?
couldn't you have been screaming?
couldn't they have been screaming?