I could snub you could snub she could snub we could snub you could snub they could snub
V-ing form
I could be snubbing you could be snubbing she could be snubbing we could be snubbing you could be snubbing they could be snubbing
Perfect
I could have snubbed you could have snubbed she could have snubbed we could have snubbed you could have snubbed they could have snubbed
V-ing perfect
I could have been snubbing you could have been snubbing she could have been snubbing we could have been snubbing you could have been snubbing they could have been snubbing
Negation
Simple form
I could not snub you could not snub she could not snub we could not snub you could not snub they could not snub
V-ing form
I could not be snubbing you could not be snubbing she could not be snubbing we could not be snubbing you could not be snubbing they could not be snubbing
Perfect
I could not have snubbed you could not have snubbed she could not have snubbed we could not have snubbed you could not have snubbed they could not have snubbed
V-ing perfect
I could not have been snubbing you could not have been snubbing she could not have been snubbing we could not have been snubbing you could not have been snubbing they could not have been snubbing
Interrogative form
Simple form
could I snub? could you snub? could she snub? could we snub? could you snub? could they snub?
V-ing form
could I be snubbing? could you be snubbing? could she be snubbing? could we be snubbing? could you be snubbing? could they be snubbing?
Perfect
could I have snubbed? could you have snubbed? could she have snubbed? could we have snubbed? could you have snubbed? could they have snubbed?
V-ing perfect
could I have been snubbing? could you have been snubbing? could she have been snubbing? could we have been snubbing? could you have been snubbing? could they have been snubbing?
Interro-negative form
Simple form
could I not snub? could you not snub? could she not snub? could we not snub? could you not snub? could they not snub?
V-ing form
could I not be snubbing? could you not be snubbing? could she not be snubbing? could we not be snubbing? could you not be snubbing? could they not be snubbing?
Perfect
could I not have snubbed? could you not have snubbed? could she not have snubbed? could we not have snubbed? could you not have snubbed? could they not have snubbed?
V-ing perfect
could I not have been snubbing? could you not have been snubbing? could she not have been snubbing? could we not have been snubbing? could you not have been snubbing? could they not have been snubbing?