I can adopt you can adopt she can adopt we can adopt you can adopt they can adopt
V-ing form
I can be adopting you can be adopting she can be adopting we can be adopting you can be adopting they can be adopting
Perfect
I can have adopted you can have adopted she can have adopted we can have adopted you can have adopted they can have adopted
V-ing perfect
I can have been adopting you can have been adopting she can have been adopting we can have been adopting you can have been adopting they can have been adopting
Negation
Simple form
I can't adopt you can't adopt she can't adopt we can't adopt you can't adopt they can't adopt
V-ing form
I can't be adopting you can't be adopting she can't be adopting we can't be adopting you can't be adopting they can't be adopting
Perfect
I can't have adopted you can't have adopted she can't have adopted we can't have adopted you can't have adopted they can't have adopted
V-ing perfect
I can't have been adopting you can't have been adopting she can't have been adopting we can't have been adopting you can't have been adopting they can't have been adopting
Interrogative form
Simple form
can I adopt? can you adopt? can she adopt? can we adopt? can you adopt? can they adopt?
V-ing form
can I be adopting? can you be adopting? can she be adopting? can we be adopting? can you be adopting? can they be adopting?
Perfect
can I have adopted? can you have adopted? can she have adopted? can we have adopted? can you have adopted? can they have adopted?
V-ing perfect
can I have been adopting? can you have been adopting? can she have been adopting? can we have been adopting? can you have been adopting? can they have been adopting?
Interro-negative form
Simple form
can't I adopt? can't you adopt? can't she adopt? can't we adopt? can't you adopt? can't they adopt?
V-ing form
can't I be adopting? can't you be adopting? can't she be adopting? can't we be adopting? can't you be adopting? can't they be adopting?
Perfect
can't I have adopted? can't you have adopted? can't she have adopted? can't we have adopted? can't you have adopted? can't they have adopted?
V-ing perfect
can't I have been adopting? can't you have been adopting? can't she have been adopting? can't we have been adopting? can't you have been adopting? can't they have been adopting?