English verb conjugation
COULD CROAK

Regular verb: croak - croaked - croaked

Affirmation

Simple form	V-ing form
I could croak you could croak she could croak we could croak you could croak they could croak	I could be croaking you could be croaking she could be croaking we could be croaking you could be croaking they could be croaking
Perfect	V-ing perfect
I could have croaked you could have croaked she could have croaked we could have croaked you could have croaked they could have croaked	I could have been croaking you could have been croaking she could have been croaking we could have been croaking you could have been croaking they could have been croaking

Negation

Simple form	V-ing form
I could not croak you could not croak she could not croak we could not croak you could not croak they could not croak	I could not be croaking you could not be croaking she could not be croaking we could not be croaking you could not be croaking they could not be croaking
Perfect	V-ing perfect
I could not have croaked you could not have croaked she could not have croaked we could not have croaked you could not have croaked they could not have croaked	I could not have been croaking you could not have been croaking she could not have been croaking we could not have been croaking you could not have been croaking they could not have been croaking

Interrogative form

Simple form	V-ing form
could I croak? could you croak? could she croak? could we croak? could you croak? could they croak?	could I be croaking? could you be croaking? could she be croaking? could we be croaking? could you be croaking? could they be croaking?
Perfect	V-ing perfect
could I have croaked? could you have croaked? could she have croaked? could we have croaked? could you have croaked? could they have croaked?	could I have been croaking? could you have been croaking? could she have been croaking? could we have been croaking? could you have been croaking? could they have been croaking?

Interro-negative form

Simple form	V-ing form
could I not croak? could you not croak? could she not croak? could we not croak? could you not croak? could they not croak?	could I not be croaking? could you not be croaking? could she not be croaking? could we not be croaking? could you not be croaking? could they not be croaking?
Perfect	V-ing perfect
could I not have croaked? could you not have croaked? could she not have croaked? could we not have croaked? could you not have croaked? could they not have croaked?	could I not have been croaking? could you not have been croaking? could she not have been croaking? could we not have been croaking? could you not have been croaking? could they not have been croaking?