I could canvass you could canvass he could canvass we could canvass you could canvass they could canvass
V-ing form
I could be canvassing you could be canvassing he could be canvassing we could be canvassing you could be canvassing they could be canvassing
Perfect
I could have canvassed you could have canvassed he could have canvassed we could have canvassed you could have canvassed they could have canvassed
V-ing perfect
I could have been canvassing you could have been canvassing he could have been canvassing we could have been canvassing you could have been canvassing they could have been canvassing
Negation
Simple form
I could not canvass you could not canvass he could not canvass we could not canvass you could not canvass they could not canvass
V-ing form
I could not be canvassing you could not be canvassing he could not be canvassing we could not be canvassing you could not be canvassing they could not be canvassing
Perfect
I could not have canvassed you could not have canvassed he could not have canvassed we could not have canvassed you could not have canvassed they could not have canvassed
V-ing perfect
I could not have been canvassing you could not have been canvassing he could not have been canvassing we could not have been canvassing you could not have been canvassing they could not have been canvassing
Interrogative form
Simple form
could I canvass? could you canvass? could he canvass? could we canvass? could you canvass? could they canvass?
V-ing form
could I be canvassing? could you be canvassing? could he be canvassing? could we be canvassing? could you be canvassing? could they be canvassing?
Perfect
could I have canvassed? could you have canvassed? could he have canvassed? could we have canvassed? could you have canvassed? could they have canvassed?
V-ing perfect
could I have been canvassing? could you have been canvassing? could he have been canvassing? could we have been canvassing? could you have been canvassing? could they have been canvassing?
Interro-negative form
Simple form
could I not canvass? could you not canvass? could he not canvass? could we not canvass? could you not canvass? could they not canvass?
V-ing form
could I not be canvassing? could you not be canvassing? could he not be canvassing? could we not be canvassing? could you not be canvassing? could they not be canvassing?
Perfect
could I not have canvassed? could you not have canvassed? could he not have canvassed? could we not have canvassed? could you not have canvassed? could they not have canvassed?
V-ing perfect
could I not have been canvassing? could you not have been canvassing? could he not have been canvassing? could we not have been canvassing? could you not have been canvassing? could they not have been canvassing?