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 could not stanch you could not stanch he could not stanch we could not stanch you could not stanch they could not stanch
V-ing form
I could not be stanching you could not be stanching he could not be stanching we could not be stanching you could not be stanching they could not be stanching
Perfect
I could not have stanched you could not have stanched he could not have stanched we could not have stanched you could not have stanched they could not have stanched
V-ing perfect
I could not have been stanching you could not have been stanching he could not have been stanching we could not have been stanching you could not have been stanching they could not 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
could I not stanch? could you not stanch? could he not stanch? could we not stanch? could you not stanch? could they not stanch?
V-ing form
could I not be stanching? could you not be stanching? could he not be stanching? could we not be stanching? could you not be stanching? could they not be stanching?
Perfect
could I not have stanched? could you not have stanched? could he not have stanched? could we not have stanched? could you not have stanched? could they not have stanched?
V-ing perfect
could I not have been stanching? could you not have been stanching? could he not have been stanching? could we not have been stanching? could you not have been stanching? could they not have been stanching?