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