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 couldn't scowl you couldn't scowl he couldn't scowl we couldn't scowl you couldn't scowl they couldn't scowl	I couldn't be scowling you couldn't be scowling he couldn't be scowling we couldn't be scowling you couldn't be scowling they couldn't be scowling
Perfect	V-ing perfect
I couldn't have scowled you couldn't have scowled he couldn't have scowled we couldn't have scowled you couldn't have scowled they couldn't have scowled	I couldn't have been scowling you couldn't have been scowling he couldn't have been scowling we couldn't have been scowling you couldn't have been scowling they couldn't 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
couldn't I scowl? couldn't you scowl? couldn't he scowl? couldn't we scowl? couldn't you scowl? couldn't they scowl?	couldn't I be scowling? couldn't you be scowling? couldn't he be scowling? couldn't we be scowling? couldn't you be scowling? couldn't they be scowling?
Perfect	V-ing perfect
couldn't I have scowled? couldn't you have scowled? couldn't he have scowled? couldn't we have scowled? couldn't you have scowled? couldn't they have scowled?	couldn't I have been scowling? couldn't you have been scowling? couldn't he have been scowling? couldn't we have been scowling? couldn't you have been scowling? couldn't they have been scowling?