English verb conjugation
COULD SCREAK

Regular verb: screak - screaked - screaked

Affirmation

Simple form	V-ing form
I could screak you could screak he could screak we could screak you could screak they could screak	I could be screaking you could be screaking he could be screaking we could be screaking you could be screaking they could be screaking
Perfect	V-ing perfect
I could have screaked you could have screaked he could have screaked we could have screaked you could have screaked they could have screaked	I could have been screaking you could have been screaking he could have been screaking we could have been screaking you could have been screaking they could have been screaking

Negation

Simple form	V-ing form
I couldn't screak you couldn't screak he couldn't screak we couldn't screak you couldn't screak they couldn't screak	I couldn't be screaking you couldn't be screaking he couldn't be screaking we couldn't be screaking you couldn't be screaking they couldn't be screaking
Perfect	V-ing perfect
I couldn't have screaked you couldn't have screaked he couldn't have screaked we couldn't have screaked you couldn't have screaked they couldn't have screaked	I couldn't have been screaking you couldn't have been screaking he couldn't have been screaking we couldn't have been screaking you couldn't have been screaking they couldn't have been screaking

Interrogative form

Simple form	V-ing form
could I screak? could you screak? could he screak? could we screak? could you screak? could they screak?	could I be screaking? could you be screaking? could he be screaking? could we be screaking? could you be screaking? could they be screaking?
Perfect	V-ing perfect
could I have screaked? could you have screaked? could he have screaked? could we have screaked? could you have screaked? could they have screaked?	could I have been screaking? could you have been screaking? could he have been screaking? could we have been screaking? could you have been screaking? could they have been screaking?

Interro-negative form

Simple form	V-ing form
couldn't I screak? couldn't you screak? couldn't he screak? couldn't we screak? couldn't you screak? couldn't they screak?	couldn't I be screaking? couldn't you be screaking? couldn't he be screaking? couldn't we be screaking? couldn't you be screaking? couldn't they be screaking?
Perfect	V-ing perfect
couldn't I have screaked? couldn't you have screaked? couldn't he have screaked? couldn't we have screaked? couldn't you have screaked? couldn't they have screaked?	couldn't I have been screaking? couldn't you have been screaking? couldn't he have been screaking? couldn't we have been screaking? couldn't you have been screaking? couldn't they have been screaking?