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 could not scream
you could not scream
he could not scream
we could not scream
you could not scream
they could not scream 	I could not be screaming
you could not be screaming
he could not be screaming
we could not be screaming
you could not be screaming
they could not be screaming	I could not have screamed
you could not have screamed
he could not have screamed
we could not have screamed
you could not have screamed
they could not have screamed	I could not have been screaming
you could not have been screaming
he could not have been screaming
we could not have been screaming
you could not have been screaming
they could not 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 	
could I not scream?
could you not scream?
could he not scream?
could we not scream?
could you not scream?
could they not scream? 	could I not be screaming?
could you not be screaming?
could he not be screaming?
could we not be screaming?
could you not be screaming?
could they not be screaming? 	could I not have screamed?
could you not have screamed?
could he not have screamed?
could we not have screamed?
could you not have screamed?
could they not have screamed? 	could I not have been screaming?
could you not have been screaming?
could he not have been screaming?
could we not have been screaming?
could you not have been screaming?
could they not have been screaming?