I could circumcise you could circumcise he could circumcise we could circumcise you could circumcise they could circumcise
V-ing form
I could be circumcising you could be circumcising he could be circumcising we could be circumcising you could be circumcising they could be circumcising
Perfect
I could have circumcised you could have circumcised he could have circumcised we could have circumcised you could have circumcised they could have circumcised
V-ing perfect
I could have been circumcising you could have been circumcising he could have been circumcising we could have been circumcising you could have been circumcising they could have been circumcising
Negation
Simple form
I could not circumcise you could not circumcise he could not circumcise we could not circumcise you could not circumcise they could not circumcise
V-ing form
I could not be circumcising you could not be circumcising he could not be circumcising we could not be circumcising you could not be circumcising they could not be circumcising
Perfect
I could not have circumcised you could not have circumcised he could not have circumcised we could not have circumcised you could not have circumcised they could not have circumcised
V-ing perfect
I could not have been circumcising you could not have been circumcising he could not have been circumcising we could not have been circumcising you could not have been circumcising they could not have been circumcising
Interrogative form
Simple form
could I circumcise? could you circumcise? could he circumcise? could we circumcise? could you circumcise? could they circumcise?
V-ing form
could I be circumcising? could you be circumcising? could he be circumcising? could we be circumcising? could you be circumcising? could they be circumcising?
Perfect
could I have circumcised? could you have circumcised? could he have circumcised? could we have circumcised? could you have circumcised? could they have circumcised?
V-ing perfect
could I have been circumcising? could you have been circumcising? could he have been circumcising? could we have been circumcising? could you have been circumcising? could they have been circumcising?
Interro-negative form
Simple form
could I not circumcise? could you not circumcise? could he not circumcise? could we not circumcise? could you not circumcise? could they not circumcise?
V-ing form
could I not be circumcising? could you not be circumcising? could he not be circumcising? could we not be circumcising? could you not be circumcising? could they not be circumcising?
Perfect
could I not have circumcised? could you not have circumcised? could he not have circumcised? could we not have circumcised? could you not have circumcised? could they not have circumcised?
V-ing perfect
could I not have been circumcising? could you not have been circumcising? could he not have been circumcising? could we not have been circumcising? could you not have been circumcising? could they not have been circumcising?