I must regroup you must regroup she must regroup we must regroup you must regroup they must regroup
V-ing form
I must be regrouping you must be regrouping she must be regrouping we must be regrouping you must be regrouping they must be regrouping
Perfect
I must have regrouped you must have regrouped she must have regrouped we must have regrouped you must have regrouped they must have regrouped
V-ing perfect
I must have been regrouping you must have been regrouping she must have been regrouping we must have been regrouping you must have been regrouping they must have been regrouping
Negation
Simple form
I mustn't regroup you mustn't regroup she mustn't regroup we mustn't regroup you mustn't regroup they mustn't regroup
V-ing form
I mustn't be regrouping you mustn't be regrouping she mustn't be regrouping we mustn't be regrouping you mustn't be regrouping they mustn't be regrouping
Perfect
I mustn't have regrouped you mustn't have regrouped she mustn't have regrouped we mustn't have regrouped you mustn't have regrouped they mustn't have regrouped
V-ing perfect
I mustn't have been regrouping you mustn't have been regrouping she mustn't have been regrouping we mustn't have been regrouping you mustn't have been regrouping they mustn't have been regrouping
Interrogative form
Simple form
must I regroup? must you regroup? must she regroup? must we regroup? must you regroup? must they regroup?
V-ing form
must I be regrouping? must you be regrouping? must she be regrouping? must we be regrouping? must you be regrouping? must they be regrouping?
Perfect
must I have regrouped? must you have regrouped? must she have regrouped? must we have regrouped? must you have regrouped? must they have regrouped?
V-ing perfect
must I have been regrouping? must you have been regrouping? must she have been regrouping? must we have been regrouping? must you have been regrouping? must they have been regrouping?
Interro-negative form
Simple form
mustn't I regroup? mustn't you regroup? mustn't she regroup? mustn't we regroup? mustn't you regroup? mustn't they regroup?
V-ing form
mustn't I be regrouping? mustn't you be regrouping? mustn't she be regrouping? mustn't we be regrouping? mustn't you be regrouping? mustn't they be regrouping?
Perfect
mustn't I have regrouped? mustn't you have regrouped? mustn't she have regrouped? mustn't we have regrouped? mustn't you have regrouped? mustn't they have regrouped?
V-ing perfect
mustn't I have been regrouping? mustn't you have been regrouping? mustn't she have been regrouping? mustn't we have been regrouping? mustn't you have been regrouping? mustn't they have been regrouping?