I could shun you could shun he could shun we could shun you could shun they could shun
V-ing form
I could be shunning you could be shunning he could be shunning we could be shunning you could be shunning they could be shunning
Perfect
I could have shunned you could have shunned he could have shunned we could have shunned you could have shunned they could have shunned
V-ing perfect
I could have been shunning you could have been shunning he could have been shunning we could have been shunning you could have been shunning they could have been shunning
Negation
Simple form
I couldn't shun you couldn't shun he couldn't shun we couldn't shun you couldn't shun they couldn't shun
V-ing form
I couldn't be shunning you couldn't be shunning he couldn't be shunning we couldn't be shunning you couldn't be shunning they couldn't be shunning
Perfect
I couldn't have shunned you couldn't have shunned he couldn't have shunned we couldn't have shunned you couldn't have shunned they couldn't have shunned
V-ing perfect
I couldn't have been shunning you couldn't have been shunning he couldn't have been shunning we couldn't have been shunning you couldn't have been shunning they couldn't have been shunning
Interrogative form
Simple form
could I shun? could you shun? could he shun? could we shun? could you shun? could they shun?
V-ing form
could I be shunning? could you be shunning? could he be shunning? could we be shunning? could you be shunning? could they be shunning?
Perfect
could I have shunned? could you have shunned? could he have shunned? could we have shunned? could you have shunned? could they have shunned?
V-ing perfect
could I have been shunning? could you have been shunning? could he have been shunning? could we have been shunning? could you have been shunning? could they have been shunning?
Interro-negative form
Simple form
couldn't I shun? couldn't you shun? couldn't he shun? couldn't we shun? couldn't you shun? couldn't they shun?
V-ing form
couldn't I be shunning? couldn't you be shunning? couldn't he be shunning? couldn't we be shunning? couldn't you be shunning? couldn't they be shunning?
Perfect
couldn't I have shunned? couldn't you have shunned? couldn't he have shunned? couldn't we have shunned? couldn't you have shunned? couldn't they have shunned?
V-ing perfect
couldn't I have been shunning? couldn't you have been shunning? couldn't he have been shunning? couldn't we have been shunning? couldn't you have been shunning? couldn't they have been shunning?