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