I can regroup you can regroup he can regroup we can regroup you can regroup they can regroup
V-ing form
I can be regrouping you can be regrouping he can be regrouping we can be regrouping you can be regrouping they can be regrouping
Perfect
I can have regrouped you can have regrouped he can have regrouped we can have regrouped you can have regrouped they can have regrouped
V-ing perfect
I can have been regrouping you can have been regrouping he can have been regrouping we can have been regrouping you can have been regrouping they can have been regrouping
Negation
Simple form
I cannot regroup you cannot regroup he cannot regroup we cannot regroup you cannot regroup they cannot regroup
V-ing form
I cannot be regrouping you cannot be regrouping he cannot be regrouping we cannot be regrouping you cannot be regrouping they cannot be regrouping
Perfect
I cannot have regrouped you cannot have regrouped he cannot have regrouped we cannot have regrouped you cannot have regrouped they cannot have regrouped
V-ing perfect
I cannot have been regrouping you cannot have been regrouping he cannot have been regrouping we cannot have been regrouping you cannot have been regrouping they cannot have been regrouping
Interrogative form
Simple form
can I regroup? can you regroup? can he regroup? can we regroup? can you regroup? can they regroup?
V-ing form
can I be regrouping? can you be regrouping? can he be regrouping? can we be regrouping? can you be regrouping? can they be regrouping?
Perfect
can I have regrouped? can you have regrouped? can he have regrouped? can we have regrouped? can you have regrouped? can they have regrouped?
V-ing perfect
can I have been regrouping? can you have been regrouping? can he have been regrouping? can we have been regrouping? can you have been regrouping? can they have been regrouping?
Interro-negative form
Simple form
can I not regroup? can you not regroup? can he not regroup? can we not regroup? can you not regroup? can they not regroup?
V-ing form
can I not be regrouping? can you not be regrouping? can he not be regrouping? can we not be regrouping? can you not be regrouping? can they not be regrouping?
Perfect
can I not have regrouped? can you not have regrouped? can he not have regrouped? can we not have regrouped? can you not have regrouped? can they not have regrouped?
V-ing perfect
can I not have been regrouping? can you not have been regrouping? can he not have been regrouping? can we not have been regrouping? can you not have been regrouping? can they not have been regrouping?