Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could growl growl you could growl growl she could growl growl we could growl growl you could growl growl they could growl growl
V-ing form
I could be growl growling you could be growl growling she could be growl growling we could be growl growling you could be growl growling they could be growl growling
Perfect
I could have growl growled you could have growl growled she could have growl growled we could have growl growled you could have growl growled they could have growl growled
V-ing perfect
I could have been growl growling you could have been growl growling she could have been growl growling we could have been growl growling you could have been growl growling they could have been growl growling
Negation
Simple form
I couldn't growl growl you couldn't growl growl she couldn't growl growl we couldn't growl growl you couldn't growl growl they couldn't growl growl
V-ing form
I couldn't be growl growling you couldn't be growl growling she couldn't be growl growling we couldn't be growl growling you couldn't be growl growling they couldn't be growl growling
Perfect
I couldn't have growl growled you couldn't have growl growled she couldn't have growl growled we couldn't have growl growled you couldn't have growl growled they couldn't have growl growled
V-ing perfect
I couldn't have been growl growling you couldn't have been growl growling she couldn't have been growl growling we couldn't have been growl growling you couldn't have been growl growling they couldn't have been growl growling
Interrogative form
Simple form
could I growl growl? could you growl growl? could she growl growl? could we growl growl? could you growl growl? could they growl growl?
V-ing form
could I be growl growling? could you be growl growling? could she be growl growling? could we be growl growling? could you be growl growling? could they be growl growling?
Perfect
could I have growl growled? could you have growl growled? could she have growl growled? could we have growl growled? could you have growl growled? could they have growl growled?
V-ing perfect
could I have been growl growling? could you have been growl growling? could she have been growl growling? could we have been growl growling? could you have been growl growling? could they have been growl growling?
Interro-negative form
Simple form
couldn't I growl growl? couldn't you growl growl? couldn't she growl growl? couldn't we growl growl? couldn't you growl growl? couldn't they growl growl?
V-ing form
couldn't I be growl growling? couldn't you be growl growling? couldn't she be growl growling? couldn't we be growl growling? couldn't you be growl growling? couldn't they be growl growling?
Perfect
couldn't I have growl growled? couldn't you have growl growled? couldn't she have growl growled? couldn't we have growl growled? couldn't you have growl growled? couldn't they have growl growled?
V-ing perfect
couldn't I have been growl growling? couldn't you have been growl growling? couldn't she have been growl growling? couldn't we have been growl growling? couldn't you have been growl growling? couldn't they have been growl growling?