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 couldn't circumcise you couldn't circumcise he couldn't circumcise we couldn't circumcise you couldn't circumcise they couldn't circumcise
V-ing form
I couldn't be circumcising you couldn't be circumcising he couldn't be circumcising we couldn't be circumcising you couldn't be circumcising they couldn't be circumcising
Perfect
I couldn't have circumcised you couldn't have circumcised he couldn't have circumcised we couldn't have circumcised you couldn't have circumcised they couldn't have circumcised
V-ing perfect
I couldn't have been circumcising you couldn't have been circumcising he couldn't have been circumcising we couldn't have been circumcising you couldn't have been circumcising they couldn't 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
couldn't I circumcise? couldn't you circumcise? couldn't he circumcise? couldn't we circumcise? couldn't you circumcise? couldn't they circumcise?
V-ing form
couldn't I be circumcising? couldn't you be circumcising? couldn't he be circumcising? couldn't we be circumcising? couldn't you be circumcising? couldn't they be circumcising?
Perfect
couldn't I have circumcised? couldn't you have circumcised? couldn't he have circumcised? couldn't we have circumcised? couldn't you have circumcised? couldn't they have circumcised?
V-ing perfect
couldn't I have been circumcising? couldn't you have been circumcising? couldn't he have been circumcising? couldn't we have been circumcising? couldn't you have been circumcising? couldn't they have been circumcising?