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