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