I could proceed you could proceed he could proceed we could proceed you could proceed they could proceed
V-ing form
I could be proceeding you could be proceeding he could be proceeding we could be proceeding you could be proceeding they could be proceeding
Perfect
I could have proceeded you could have proceeded he could have proceeded we could have proceeded you could have proceeded they could have proceeded
V-ing perfect
I could have been proceeding you could have been proceeding he could have been proceeding we could have been proceeding you could have been proceeding they could have been proceeding
Negation
Simple form
I could not proceed you could not proceed he could not proceed we could not proceed you could not proceed they could not proceed
V-ing form
I could not be proceeding you could not be proceeding he could not be proceeding we could not be proceeding you could not be proceeding they could not be proceeding
Perfect
I could not have proceeded you could not have proceeded he could not have proceeded we could not have proceeded you could not have proceeded they could not have proceeded
V-ing perfect
I could not have been proceeding you could not have been proceeding he could not have been proceeding we could not have been proceeding you could not have been proceeding they could not have been proceeding
Interrogative form
Simple form
could I proceed? could you proceed? could he proceed? could we proceed? could you proceed? could they proceed?
V-ing form
could I be proceeding? could you be proceeding? could he be proceeding? could we be proceeding? could you be proceeding? could they be proceeding?
Perfect
could I have proceeded? could you have proceeded? could he have proceeded? could we have proceeded? could you have proceeded? could they have proceeded?
V-ing perfect
could I have been proceeding? could you have been proceeding? could he have been proceeding? could we have been proceeding? could you have been proceeding? could they have been proceeding?
Interro-negative form
Simple form
could I not proceed? could you not proceed? could he not proceed? could we not proceed? could you not proceed? could they not proceed?
V-ing form
could I not be proceeding? could you not be proceeding? could he not be proceeding? could we not be proceeding? could you not be proceeding? could they not be proceeding?
Perfect
could I not have proceeded? could you not have proceeded? could he not have proceeded? could we not have proceeded? could you not have proceeded? could they not have proceeded?
V-ing perfect
could I not have been proceeding? could you not have been proceeding? could he not have been proceeding? could we not have been proceeding? could you not have been proceeding? could they not have been proceeding?