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 could not screak you could not screak he could not screak we could not screak you could not screak they could not screak	I could not be screaking you could not be screaking he could not be screaking we could not be screaking you could not be screaking they could not be screaking
Perfect	V-ing perfect
I could not have screaked you could not have screaked he could not have screaked we could not have screaked you could not have screaked they could not have screaked	I could not have been screaking you could not have been screaking he could not have been screaking we could not have been screaking you could not have been screaking they could not 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
could I not screak? could you not screak? could he not screak? could we not screak? could you not screak? could they not screak?	could I not be screaking? could you not be screaking? could he not be screaking? could we not be screaking? could you not be screaking? could they not be screaking?
Perfect	V-ing perfect
could I not have screaked? could you not have screaked? could he not have screaked? could we not have screaked? could you not have screaked? could they not have screaked?	could I not have been screaking? could you not have been screaking? could he not have been screaking? could we not have been screaking? could you not have been screaking? could they not have been screaking?