English verb conjugation
COULD CANVASS

Regular verb: canvass - canvassed - canvassed

Affirmation

Simple form	V-ing form
I could canvass you could canvass she could canvass we could canvass you could canvass they could canvass	I could be canvassing you could be canvassing she could be canvassing we could be canvassing you could be canvassing they could be canvassing
Perfect	V-ing perfect
I could have canvassed you could have canvassed she could have canvassed we could have canvassed you could have canvassed they could have canvassed	I could have been canvassing you could have been canvassing she could have been canvassing we could have been canvassing you could have been canvassing they could have been canvassing

Negation

Simple form	V-ing form
I couldn't canvass you couldn't canvass she couldn't canvass we couldn't canvass you couldn't canvass they couldn't canvass	I couldn't be canvassing you couldn't be canvassing she couldn't be canvassing we couldn't be canvassing you couldn't be canvassing they couldn't be canvassing
Perfect	V-ing perfect
I couldn't have canvassed you couldn't have canvassed she couldn't have canvassed we couldn't have canvassed you couldn't have canvassed they couldn't have canvassed	I couldn't have been canvassing you couldn't have been canvassing she couldn't have been canvassing we couldn't have been canvassing you couldn't have been canvassing they couldn't have been canvassing

Interrogative form

Simple form	V-ing form
could I canvass? could you canvass? could she canvass? could we canvass? could you canvass? could they canvass?	could I be canvassing? could you be canvassing? could she be canvassing? could we be canvassing? could you be canvassing? could they be canvassing?
Perfect	V-ing perfect
could I have canvassed? could you have canvassed? could she have canvassed? could we have canvassed? could you have canvassed? could they have canvassed?	could I have been canvassing? could you have been canvassing? could she have been canvassing? could we have been canvassing? could you have been canvassing? could they have been canvassing?

Interro-negative form

Simple form	V-ing form
couldn't I canvass? couldn't you canvass? couldn't she canvass? couldn't we canvass? couldn't you canvass? couldn't they canvass?	couldn't I be canvassing? couldn't you be canvassing? couldn't she be canvassing? couldn't we be canvassing? couldn't you be canvassing? couldn't they be canvassing?
Perfect	V-ing perfect
couldn't I have canvassed? couldn't you have canvassed? couldn't she have canvassed? couldn't we have canvassed? couldn't you have canvassed? couldn't they have canvassed?	couldn't I have been canvassing? couldn't you have been canvassing? couldn't she have been canvassing? couldn't we have been canvassing? couldn't you have been canvassing? couldn't they have been canvassing?