I could adhere you could adhere she could adhere we could adhere you could adhere they could adhere
V-ing form
I could be adhering you could be adhering she could be adhering we could be adhering you could be adhering they could be adhering
Perfect
I could have adhered you could have adhered she 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 she could have been adhering we could have been adhering you could have been adhering they could have been adhering
Negation
Simple form
I couldn't adhere you couldn't adhere she couldn't adhere we couldn't adhere you couldn't adhere they couldn't adhere
V-ing form
I couldn't be adhering you couldn't be adhering she couldn't be adhering we couldn't be adhering you couldn't be adhering they couldn't be adhering
Perfect
I couldn't have adhered you couldn't have adhered she couldn't have adhered we couldn't have adhered you couldn't have adhered they couldn't have adhered
V-ing perfect
I couldn't have been adhering you couldn't have been adhering she couldn't have been adhering we couldn't have been adhering you couldn't have been adhering they couldn't have been adhering
Interrogative form
Simple form
could I adhere? could you adhere? could she adhere? could we adhere? could you adhere? could they adhere?
V-ing form
could I be adhering? could you be adhering? could she be adhering? could we be adhering? could you be adhering? could they be adhering?
Perfect
could I have adhered? could you have adhered? could she 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 she have been adhering? could we have been adhering? could you have been adhering? could they have been adhering?
Interro-negative form
Simple form
couldn't I adhere? couldn't you adhere? couldn't she adhere? couldn't we adhere? couldn't you adhere? couldn't they adhere?
V-ing form
couldn't I be adhering? couldn't you be adhering? couldn't she be adhering? couldn't we be adhering? couldn't you be adhering? couldn't they be adhering?
Perfect
couldn't I have adhered? couldn't you have adhered? couldn't she have adhered? couldn't we have adhered? couldn't you have adhered? couldn't they have adhered?
V-ing perfect
couldn't I have been adhering? couldn't you have been adhering? couldn't she have been adhering? couldn't we have been adhering? couldn't you have been adhering? couldn't they have been adhering?