I could brook you could brook he could brook we could brook you could brook they could brook
V-ing form
I could be brooking you could be brooking he could be brooking we could be brooking you could be brooking they could be brooking
Perfect
I could have brooked you could have brooked he could have brooked we could have brooked you could have brooked they could have brooked
V-ing perfect
I could have been brooking you could have been brooking he could have been brooking we could have been brooking you could have been brooking they could have been brooking
Negation
Simple form
I couldn't brook you couldn't brook he couldn't brook we couldn't brook you couldn't brook they couldn't brook
V-ing form
I couldn't be brooking you couldn't be brooking he couldn't be brooking we couldn't be brooking you couldn't be brooking they couldn't be brooking
Perfect
I couldn't have brooked you couldn't have brooked he couldn't have brooked we couldn't have brooked you couldn't have brooked they couldn't have brooked
V-ing perfect
I couldn't have been brooking you couldn't have been brooking he couldn't have been brooking we couldn't have been brooking you couldn't have been brooking they couldn't have been brooking
Interrogative form
Simple form
could I brook? could you brook? could he brook? could we brook? could you brook? could they brook?
V-ing form
could I be brooking? could you be brooking? could he be brooking? could we be brooking? could you be brooking? could they be brooking?
Perfect
could I have brooked? could you have brooked? could he have brooked? could we have brooked? could you have brooked? could they have brooked?
V-ing perfect
could I have been brooking? could you have been brooking? could he have been brooking? could we have been brooking? could you have been brooking? could they have been brooking?
Interro-negative form
Simple form
couldn't I brook? couldn't you brook? couldn't he brook? couldn't we brook? couldn't you brook? couldn't they brook?
V-ing form
couldn't I be brooking? couldn't you be brooking? couldn't he be brooking? couldn't we be brooking? couldn't you be brooking? couldn't they be brooking?
Perfect
couldn't I have brooked? couldn't you have brooked? couldn't he have brooked? couldn't we have brooked? couldn't you have brooked? couldn't they have brooked?
V-ing perfect
couldn't I have been brooking? couldn't you have been brooking? couldn't he have been brooking? couldn't we have been brooking? couldn't you have been brooking? couldn't they have been brooking?