English verb conjugation
COULD SCOWL

Regular verb: scowl - scowled - scowled

Affirmation

Simple form	V-ing form
I could scowl you could scowl he could scowl we could scowl you could scowl they could scowl	I could be scowling you could be scowling he could be scowling we could be scowling you could be scowling they could be scowling
Perfect	V-ing perfect
I could have scowled you could have scowled he could have scowled we could have scowled you could have scowled they could have scowled	I could have been scowling you could have been scowling he could have been scowling we could have been scowling you could have been scowling they could have been scowling

Negation

Simple form	V-ing form
I could not scowl you could not scowl he could not scowl we could not scowl you could not scowl they could not scowl	I could not be scowling you could not be scowling he could not be scowling we could not be scowling you could not be scowling they could not be scowling
Perfect	V-ing perfect
I could not have scowled you could not have scowled he could not have scowled we could not have scowled you could not have scowled they could not have scowled	I could not have been scowling you could not have been scowling he could not have been scowling we could not have been scowling you could not have been scowling they could not have been scowling

Interrogative form

Simple form	V-ing form
could I scowl? could you scowl? could he scowl? could we scowl? could you scowl? could they scowl?	could I be scowling? could you be scowling? could he be scowling? could we be scowling? could you be scowling? could they be scowling?
Perfect	V-ing perfect
could I have scowled? could you have scowled? could he have scowled? could we have scowled? could you have scowled? could they have scowled?	could I have been scowling? could you have been scowling? could he have been scowling? could we have been scowling? could you have been scowling? could they have been scowling?

Interro-negative form

Simple form	V-ing form
could I not scowl? could you not scowl? could he not scowl? could we not scowl? could you not scowl? could they not scowl?	could I not be scowling? could you not be scowling? could he not be scowling? could we not be scowling? could you not be scowling? could they not be scowling?
Perfect	V-ing perfect
could I not have scowled? could you not have scowled? could he not have scowled? could we not have scowled? could you not have scowled? could they not have scowled?	could I not have been scowling? could you not have been scowling? could he not have been scowling? could we not have been scowling? could you not have been scowling? could they not have been scowling?