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