I can span you can span she can span we can span you can span they can span
V-ing form
I can be spanning you can be spanning she can be spanning we can be spanning you can be spanning they can be spanning
Perfect
I can have spanned you can have spanned she can have spanned we can have spanned you can have spanned they can have spanned
V-ing perfect
I can have been spanning you can have been spanning she can have been spanning we can have been spanning you can have been spanning they can have been spanning
Negation
Simple form
I cannot span you cannot span she cannot span we cannot span you cannot span they cannot span
V-ing form
I cannot be spanning you cannot be spanning she cannot be spanning we cannot be spanning you cannot be spanning they cannot be spanning
Perfect
I cannot have spanned you cannot have spanned she cannot have spanned we cannot have spanned you cannot have spanned they cannot have spanned
V-ing perfect
I cannot have been spanning you cannot have been spanning she cannot have been spanning we cannot have been spanning you cannot have been spanning they cannot have been spanning
Interrogative form
Simple form
can I span? can you span? can she span? can we span? can you span? can they span?
V-ing form
can I be spanning? can you be spanning? can she be spanning? can we be spanning? can you be spanning? can they be spanning?
Perfect
can I have spanned? can you have spanned? can she have spanned? can we have spanned? can you have spanned? can they have spanned?
V-ing perfect
can I have been spanning? can you have been spanning? can she have been spanning? can we have been spanning? can you have been spanning? can they have been spanning?
Interro-negative form
Simple form
can I not span? can you not span? can she not span? can we not span? can you not span? can they not span?
V-ing form
can I not be spanning? can you not be spanning? can she not be spanning? can we not be spanning? can you not be spanning? can they not be spanning?
Perfect
can I not have spanned? can you not have spanned? can she not have spanned? can we not have spanned? can you not have spanned? can they not have spanned?
V-ing perfect
can I not have been spanning? can you not have been spanning? can she not have been spanning? can we not have been spanning? can you not have been spanning? can they not have been spanning?