I could withstand you could withstand he could withstand we could withstand you could withstand they could withstand
V-ing form
I could be withstanding you could be withstanding he could be withstanding we could be withstanding you could be withstanding they could be withstanding
Perfect
I could have withstood you could have withstood he could have withstood we could have withstood you could have withstood they could have withstood
V-ing perfect
I could have been withstanding you could have been withstanding he could have been withstanding we could have been withstanding you could have been withstanding they could have been withstanding
Negation
Simple form
I could not withstand you could not withstand he could not withstand we could not withstand you could not withstand they could not withstand
V-ing form
I could not be withstanding you could not be withstanding he could not be withstanding we could not be withstanding you could not be withstanding they could not be withstanding
Perfect
I could not have withstood you could not have withstood he could not have withstood we could not have withstood you could not have withstood they could not have withstood
V-ing perfect
I could not have been withstanding you could not have been withstanding he could not have been withstanding we could not have been withstanding you could not have been withstanding they could not have been withstanding
Interrogative form
Simple form
could I withstand? could you withstand? could he withstand? could we withstand? could you withstand? could they withstand?
V-ing form
could I be withstanding? could you be withstanding? could he be withstanding? could we be withstanding? could you be withstanding? could they be withstanding?
Perfect
could I have withstood? could you have withstood? could he have withstood? could we have withstood? could you have withstood? could they have withstood?
V-ing perfect
could I have been withstanding? could you have been withstanding? could he have been withstanding? could we have been withstanding? could you have been withstanding? could they have been withstanding?
Interro-negative form
Simple form
could I not withstand? could you not withstand? could he not withstand? could we not withstand? could you not withstand? could they not withstand?
V-ing form
could I not be withstanding? could you not be withstanding? could he not be withstanding? could we not be withstanding? could you not be withstanding? could they not be withstanding?
Perfect
could I not have withstood? could you not have withstood? could he not have withstood? could we not have withstood? could you not have withstood? could they not have withstood?
V-ing perfect
could I not have been withstanding? could you not have been withstanding? could he not have been withstanding? could we not have been withstanding? could you not have been withstanding? could they not have been withstanding?