English verb conjugation
COULD SCREAM

Regular verb: scream - screamed - screamed

Affirmation

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