I could offîceii you could offîceii he could offîceii we could offîceii you could offîceii they could offîceii
V-ing form
I could be offîceiiing you could be offîceiiing he could be offîceiiing we could be offîceiiing you could be offîceiiing they could be offîceiiing
Perfect
I could have offîceiied you could have offîceiied he could have offîceiied we could have offîceiied you could have offîceiied they could have offîceiied
V-ing perfect
I could have been offîceiiing you could have been offîceiiing he could have been offîceiiing we could have been offîceiiing you could have been offîceiiing they could have been offîceiiing
Negation
Simple form
I could not offîceii you could not offîceii he could not offîceii we could not offîceii you could not offîceii they could not offîceii
V-ing form
I could not be offîceiiing you could not be offîceiiing he could not be offîceiiing we could not be offîceiiing you could not be offîceiiing they could not be offîceiiing
Perfect
I could not have offîceiied you could not have offîceiied he could not have offîceiied we could not have offîceiied you could not have offîceiied they could not have offîceiied
V-ing perfect
I could not have been offîceiiing you could not have been offîceiiing he could not have been offîceiiing we could not have been offîceiiing you could not have been offîceiiing they could not have been offîceiiing
Interrogative form
Simple form
could I offîceii? could you offîceii? could he offîceii? could we offîceii? could you offîceii? could they offîceii?
V-ing form
could I be offîceiiing? could you be offîceiiing? could he be offîceiiing? could we be offîceiiing? could you be offîceiiing? could they be offîceiiing?
Perfect
could I have offîceiied? could you have offîceiied? could he have offîceiied? could we have offîceiied? could you have offîceiied? could they have offîceiied?
V-ing perfect
could I have been offîceiiing? could you have been offîceiiing? could he have been offîceiiing? could we have been offîceiiing? could you have been offîceiiing? could they have been offîceiiing?
Interro-negative form
Simple form
could I not offîceii? could you not offîceii? could he not offîceii? could we not offîceii? could you not offîceii? could they not offîceii?
V-ing form
could I not be offîceiiing? could you not be offîceiiing? could he not be offîceiiing? could we not be offîceiiing? could you not be offîceiiing? could they not be offîceiiing?
Perfect
could I not have offîceiied? could you not have offîceiied? could he not have offîceiied? could we not have offîceiied? could you not have offîceiied? could they not have offîceiied?
V-ing perfect
could I not have been offîceiiing? could you not have been offîceiiing? could he not have been offîceiiing? could we not have been offîceiiing? could you not have been offîceiiing? could they not have been offîceiiing?