I could adhere you could adhere he could adhere we could adhere you could adhere they could adhere
V-ing form
I could be adhering you could be adhering he could be adhering we could be adhering you could be adhering they could be adhering
Perfect
I could have adhered you could have adhered he could have adhered we could have adhered you could have adhered they could have adhered
V-ing perfect
I could have been adhering you could have been adhering he could have been adhering we could have been adhering you could have been adhering they could have been adhering
Negation
Simple form
I could not adhere you could not adhere he could not adhere we could not adhere you could not adhere they could not adhere
V-ing form
I could not be adhering you could not be adhering he could not be adhering we could not be adhering you could not be adhering they could not be adhering
Perfect
I could not have adhered you could not have adhered he could not have adhered we could not have adhered you could not have adhered they could not have adhered
V-ing perfect
I could not have been adhering you could not have been adhering he could not have been adhering we could not have been adhering you could not have been adhering they could not have been adhering
Interrogative form
Simple form
could I adhere? could you adhere? could he adhere? could we adhere? could you adhere? could they adhere?
V-ing form
could I be adhering? could you be adhering? could he be adhering? could we be adhering? could you be adhering? could they be adhering?
Perfect
could I have adhered? could you have adhered? could he have adhered? could we have adhered? could you have adhered? could they have adhered?
V-ing perfect
could I have been adhering? could you have been adhering? could he have been adhering? could we have been adhering? could you have been adhering? could they have been adhering?
Interro-negative form
Simple form
could I not adhere? could you not adhere? could he not adhere? could we not adhere? could you not adhere? could they not adhere?
V-ing form
could I not be adhering? could you not be adhering? could he not be adhering? could we not be adhering? could you not be adhering? could they not be adhering?
Perfect
could I not have adhered? could you not have adhered? could he not have adhered? could we not have adhered? could you not have adhered? could they not have adhered?
V-ing perfect
could I not have been adhering? could you not have been adhering? could he not have been adhering? could we not have been adhering? could you not have been adhering? could they not have been adhering?