I can vanquish you can vanquish he can vanquish we can vanquish you can vanquish they can vanquish
V-ing form
I can be vanquishing you can be vanquishing he can be vanquishing we can be vanquishing you can be vanquishing they can be vanquishing
Perfect
I can have vanquished you can have vanquished he can have vanquished we can have vanquished you can have vanquished they can have vanquished
V-ing perfect
I can have been vanquishing you can have been vanquishing he can have been vanquishing we can have been vanquishing you can have been vanquishing they can have been vanquishing
Negation
Simple form
I cannot vanquish you cannot vanquish he cannot vanquish we cannot vanquish you cannot vanquish they cannot vanquish
V-ing form
I cannot be vanquishing you cannot be vanquishing he cannot be vanquishing we cannot be vanquishing you cannot be vanquishing they cannot be vanquishing
Perfect
I cannot have vanquished you cannot have vanquished he cannot have vanquished we cannot have vanquished you cannot have vanquished they cannot have vanquished
V-ing perfect
I cannot have been vanquishing you cannot have been vanquishing he cannot have been vanquishing we cannot have been vanquishing you cannot have been vanquishing they cannot have been vanquishing
Interrogative form
Simple form
can I vanquish? can you vanquish? can he vanquish? can we vanquish? can you vanquish? can they vanquish?
V-ing form
can I be vanquishing? can you be vanquishing? can he be vanquishing? can we be vanquishing? can you be vanquishing? can they be vanquishing?
Perfect
can I have vanquished? can you have vanquished? can he have vanquished? can we have vanquished? can you have vanquished? can they have vanquished?
V-ing perfect
can I have been vanquishing? can you have been vanquishing? can he have been vanquishing? can we have been vanquishing? can you have been vanquishing? can they have been vanquishing?
Interro-negative form
Simple form
can I not vanquish? can you not vanquish? can he not vanquish? can we not vanquish? can you not vanquish? can they not vanquish?
V-ing form
can I not be vanquishing? can you not be vanquishing? can he not be vanquishing? can we not be vanquishing? can you not be vanquishing? can they not be vanquishing?
Perfect
can I not have vanquished? can you not have vanquished? can he not have vanquished? can we not have vanquished? can you not have vanquished? can they not have vanquished?
V-ing perfect
can I not have been vanquishing? can you not have been vanquishing? can he not have been vanquishing? can we not have been vanquishing? can you not have been vanquishing? can they not have been vanquishing?