I could brew you could brew she could brew we could brew you could brew they could brew
V-ing form
I could be brewing you could be brewing she could be brewing we could be brewing you could be brewing they could be brewing
Perfect
I could have brewed you could have brewed she could have brewed we could have brewed you could have brewed they could have brewed
V-ing perfect
I could have been brewing you could have been brewing she could have been brewing we could have been brewing you could have been brewing they could have been brewing
Negation
Simple form
I couldn't brew you couldn't brew she couldn't brew we couldn't brew you couldn't brew they couldn't brew
V-ing form
I couldn't be brewing you couldn't be brewing she couldn't be brewing we couldn't be brewing you couldn't be brewing they couldn't be brewing
Perfect
I couldn't have brewed you couldn't have brewed she couldn't have brewed we couldn't have brewed you couldn't have brewed they couldn't have brewed
V-ing perfect
I couldn't have been brewing you couldn't have been brewing she couldn't have been brewing we couldn't have been brewing you couldn't have been brewing they couldn't have been brewing
Interrogative form
Simple form
could I brew? could you brew? could she brew? could we brew? could you brew? could they brew?
V-ing form
could I be brewing? could you be brewing? could she be brewing? could we be brewing? could you be brewing? could they be brewing?
Perfect
could I have brewed? could you have brewed? could she have brewed? could we have brewed? could you have brewed? could they have brewed?
V-ing perfect
could I have been brewing? could you have been brewing? could she have been brewing? could we have been brewing? could you have been brewing? could they have been brewing?
Interro-negative form
Simple form
couldn't I brew? couldn't you brew? couldn't she brew? couldn't we brew? couldn't you brew? couldn't they brew?
V-ing form
couldn't I be brewing? couldn't you be brewing? couldn't she be brewing? couldn't we be brewing? couldn't you be brewing? couldn't they be brewing?
Perfect
couldn't I have brewed? couldn't you have brewed? couldn't she have brewed? couldn't we have brewed? couldn't you have brewed? couldn't they have brewed?
V-ing perfect
couldn't I have been brewing? couldn't you have been brewing? couldn't she have been brewing? couldn't we have been brewing? couldn't you have been brewing? couldn't they have been brewing?