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