I could snub you could snub he could snub we could snub you could snub they could snub
V-ing form
I could be snubbing you could be snubbing he could be snubbing we could be snubbing you could be snubbing they could be snubbing
Perfect
I could have snubbed you could have snubbed he 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 he 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 he 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 he 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 he 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 he 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 he snub? could we snub? could you snub? could they snub?
V-ing form
could I be snubbing? could you be snubbing? could he be snubbing? could we be snubbing? could you be snubbing? could they be snubbing?
Perfect
could I have snubbed? could you have snubbed? could he 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 he 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 he 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 he 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 he 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 he not have been snubbing? could we not have been snubbing? could you not have been snubbing? could they not have been snubbing?