I can best you can best she can best we can best you can best they can best
V-ing form
I can be besting you can be besting she can be besting we can be besting you can be besting they can be besting
Perfect
I can have bested you can have bested she can have bested we can have bested you can have bested they can have bested
V-ing perfect
I can have been besting you can have been besting she can have been besting we can have been besting you can have been besting they can have been besting
Negation
Simple form
I cannot best you cannot best she cannot best we cannot best you cannot best they cannot best
V-ing form
I cannot be besting you cannot be besting she cannot be besting we cannot be besting you cannot be besting they cannot be besting
Perfect
I cannot have bested you cannot have bested she cannot have bested we cannot have bested you cannot have bested they cannot have bested
V-ing perfect
I cannot have been besting you cannot have been besting she cannot have been besting we cannot have been besting you cannot have been besting they cannot have been besting
Interrogative form
Simple form
can I best? can you best? can she best? can we best? can you best? can they best?
V-ing form
can I be besting? can you be besting? can she be besting? can we be besting? can you be besting? can they be besting?
Perfect
can I have bested? can you have bested? can she have bested? can we have bested? can you have bested? can they have bested?
V-ing perfect
can I have been besting? can you have been besting? can she have been besting? can we have been besting? can you have been besting? can they have been besting?
Interro-negative form
Simple form
can I not best? can you not best? can she not best? can we not best? can you not best? can they not best?
V-ing form
can I not be besting? can you not be besting? can she not be besting? can we not be besting? can you not be besting? can they not be besting?
Perfect
can I not have bested? can you not have bested? can she not have bested? can we not have bested? can you not have bested? can they not have bested?
V-ing perfect
can I not have been besting? can you not have been besting? can she not have been besting? can we not have been besting? can you not have been besting? can they not have been besting?