I can regain you can regain she can regain we can regain you can regain they can regain
V-ing form
I can be regaining you can be regaining she can be regaining we can be regaining you can be regaining they can be regaining
Perfect
I can have regained you can have regained she can have regained we can have regained you can have regained they can have regained
V-ing perfect
I can have been regaining you can have been regaining she can have been regaining we can have been regaining you can have been regaining they can have been regaining
Negation
Simple form
I can't regain you can't regain she can't regain we can't regain you can't regain they can't regain
V-ing form
I can't be regaining you can't be regaining she can't be regaining we can't be regaining you can't be regaining they can't be regaining
Perfect
I can't have regained you can't have regained she can't have regained we can't have regained you can't have regained they can't have regained
V-ing perfect
I can't have been regaining you can't have been regaining she can't have been regaining we can't have been regaining you can't have been regaining they can't have been regaining
Interrogative form
Simple form
can I regain? can you regain? can she regain? can we regain? can you regain? can they regain?
V-ing form
can I be regaining? can you be regaining? can she be regaining? can we be regaining? can you be regaining? can they be regaining?
Perfect
can I have regained? can you have regained? can she have regained? can we have regained? can you have regained? can they have regained?
V-ing perfect
can I have been regaining? can you have been regaining? can she have been regaining? can we have been regaining? can you have been regaining? can they have been regaining?
Interro-negative form
Simple form
can't I regain? can't you regain? can't she regain? can't we regain? can't you regain? can't they regain?
V-ing form
can't I be regaining? can't you be regaining? can't she be regaining? can't we be regaining? can't you be regaining? can't they be regaining?
Perfect
can't I have regained? can't you have regained? can't she have regained? can't we have regained? can't you have regained? can't they have regained?
V-ing perfect
can't I have been regaining? can't you have been regaining? can't she have been regaining? can't we have been regaining? can't you have been regaining? can't they have been regaining?