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