I can best you can best he can best we can best you can best they can best
V-ing form
I can be besting you can be besting he can be besting we can be besting you can be besting they can be besting
Perfect
I can have bested you can have bested he 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 he can have been besting we can have been besting you can have been besting they can have been besting
Negation
Simple form
I can't best you can't best he can't best we can't best you can't best they can't best
V-ing form
I can't be besting you can't be besting he can't be besting we can't be besting you can't be besting they can't be besting
Perfect
I can't have bested you can't have bested he can't have bested we can't have bested you can't have bested they can't have bested
V-ing perfect
I can't have been besting you can't have been besting he can't have been besting we can't have been besting you can't have been besting they can't have been besting
Interrogative form
Simple form
can I best? can you best? can he best? can we best? can you best? can they best?
V-ing form
can I be besting? can you be besting? can he be besting? can we be besting? can you be besting? can they be besting?
Perfect
can I have bested? can you have bested? can he 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 he have been besting? can we have been besting? can you have been besting? can they have been besting?
Interro-negative form
Simple form
can't I best? can't you best? can't he best? can't we best? can't you best? can't they best?
V-ing form
can't I be besting? can't you be besting? can't he be besting? can't we be besting? can't you be besting? can't they be besting?
Perfect
can't I have bested? can't you have bested? can't he have bested? can't we have bested? can't you have bested? can't they have bested?
V-ing perfect
can't I have been besting? can't you have been besting? can't he have been besting? can't we have been besting? can't you have been besting? can't they have been besting?