I could offend you could offend he could offend we could offend you could offend they could offend
V-ing form
I could be offending you could be offending he could be offending we could be offending you could be offending they could be offending
Perfect
I could have offended you could have offended he could have offended we could have offended you could have offended they could have offended
V-ing perfect
I could have been offending you could have been offending he could have been offending we could have been offending you could have been offending they could have been offending
Negation
Simple form
I could not offend you could not offend he could not offend we could not offend you could not offend they could not offend
V-ing form
I could not be offending you could not be offending he could not be offending we could not be offending you could not be offending they could not be offending
Perfect
I could not have offended you could not have offended he could not have offended we could not have offended you could not have offended they could not have offended
V-ing perfect
I could not have been offending you could not have been offending he could not have been offending we could not have been offending you could not have been offending they could not have been offending
Interrogative form
Simple form
could I offend? could you offend? could he offend? could we offend? could you offend? could they offend?
V-ing form
could I be offending? could you be offending? could he be offending? could we be offending? could you be offending? could they be offending?
Perfect
could I have offended? could you have offended? could he have offended? could we have offended? could you have offended? could they have offended?
V-ing perfect
could I have been offending? could you have been offending? could he have been offending? could we have been offending? could you have been offending? could they have been offending?
Interro-negative form
Simple form
could I not offend? could you not offend? could he not offend? could we not offend? could you not offend? could they not offend?
V-ing form
could I not be offending? could you not be offending? could he not be offending? could we not be offending? could you not be offending? could they not be offending?
Perfect
could I not have offended? could you not have offended? could he not have offended? could we not have offended? could you not have offended? could they not have offended?
V-ing perfect
could I not have been offending? could you not have been offending? could he not have been offending? could we not have been offending? could you not have been offending? could they not have been offending?