English verb conjugation
COULD GROWL

Regular verb: growl - growled - growled

Affirmation

Simple form	V-ing form
I could growl you could growl she could growl we could growl you could growl they could growl	I could be growling you could be growling she could be growling we could be growling you could be growling they could be growling
Perfect	V-ing perfect
I could have growled you could have growled she could have growled we could have growled you could have growled they could have growled	I could have been growling you could have been growling she could have been growling we could have been growling you could have been growling they could have been growling

Negation

Simple form	V-ing form
I could not growl you could not growl she could not growl we could not growl you could not growl they could not growl	I could not be growling you could not be growling she could not be growling we could not be growling you could not be growling they could not be growling
Perfect	V-ing perfect
I could not have growled you could not have growled she could not have growled we could not have growled you could not have growled they could not have growled	I could not have been growling you could not have been growling she could not have been growling we could not have been growling you could not have been growling they could not have been growling

Interrogative form

Simple form	V-ing form
could I growl? could you growl? could she growl? could we growl? could you growl? could they growl?	could I be growling? could you be growling? could she be growling? could we be growling? could you be growling? could they be growling?
Perfect	V-ing perfect
could I have growled? could you have growled? could she have growled? could we have growled? could you have growled? could they have growled?	could I have been growling? could you have been growling? could she have been growling? could we have been growling? could you have been growling? could they have been growling?

Interro-negative form

Simple form	V-ing form
could I not growl? could you not growl? could she not growl? could we not growl? could you not growl? could they not growl?	could I not be growling? could you not be growling? could she not be growling? could we not be growling? could you not be growling? could they not be growling?
Perfect	V-ing perfect
could I not have growled? could you not have growled? could she not have growled? could we not have growled? could you not have growled? could they not have growled?	could I not have been growling? could you not have been growling? could she not have been growling? could we not have been growling? could you not have been growling? could they not have been growling?