I can campaign you can campaign she can campaign we can campaign you can campaign they can campaign
V-ing form
I can be campaigning you can be campaigning she can be campaigning we can be campaigning you can be campaigning they can be campaigning
Perfect
I can have campaigned you can have campaigned she can have campaigned we can have campaigned you can have campaigned they can have campaigned
V-ing perfect
I can have been campaigning you can have been campaigning she can have been campaigning we can have been campaigning you can have been campaigning they can have been campaigning
Negation
Simple form
I cannot campaign you cannot campaign she cannot campaign we cannot campaign you cannot campaign they cannot campaign
V-ing form
I cannot be campaigning you cannot be campaigning she cannot be campaigning we cannot be campaigning you cannot be campaigning they cannot be campaigning
Perfect
I cannot have campaigned you cannot have campaigned she cannot have campaigned we cannot have campaigned you cannot have campaigned they cannot have campaigned
V-ing perfect
I cannot have been campaigning you cannot have been campaigning she cannot have been campaigning we cannot have been campaigning you cannot have been campaigning they cannot have been campaigning
Interrogative form
Simple form
can I campaign? can you campaign? can she campaign? can we campaign? can you campaign? can they campaign?
V-ing form
can I be campaigning? can you be campaigning? can she be campaigning? can we be campaigning? can you be campaigning? can they be campaigning?
Perfect
can I have campaigned? can you have campaigned? can she have campaigned? can we have campaigned? can you have campaigned? can they have campaigned?
V-ing perfect
can I have been campaigning? can you have been campaigning? can she have been campaigning? can we have been campaigning? can you have been campaigning? can they have been campaigning?
Interro-negative form
Simple form
can I not campaign? can you not campaign? can she not campaign? can we not campaign? can you not campaign? can they not campaign?
V-ing form
can I not be campaigning? can you not be campaigning? can she not be campaigning? can we not be campaigning? can you not be campaigning? can they not be campaigning?
Perfect
can I not have campaigned? can you not have campaigned? can she not have campaigned? can we not have campaigned? can you not have campaigned? can they not have campaigned?
V-ing perfect
can I not have been campaigning? can you not have been campaigning? can she not have been campaigning? can we not have been campaigning? can you not have been campaigning? can they not have been campaigning?