I can devolve you can devolve she can devolve we can devolve you can devolve they can devolve
V-ing form
I can be devolving you can be devolving she can be devolving we can be devolving you can be devolving they can be devolving
Perfect
I can have devolved you can have devolved she 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 she 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 she 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 she 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 she 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 she 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 she devolve? can we devolve? can you devolve? can they devolve?
V-ing form
can I be devolving? can you be devolving? can she be devolving? can we be devolving? can you be devolving? can they be devolving?
Perfect
can I have devolved? can you have devolved? can she 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 she 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 she 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 she 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 she 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 she have been devolving? can't we have been devolving? can't you have been devolving? can't they have been devolving?