I can potroast you can potroast he can potroast we can potroast you can potroast they can potroast
V-ing form
I can be potroasting you can be potroasting he can be potroasting we can be potroasting you can be potroasting they can be potroasting
Perfect
I can have potroasted you can have potroasted he can have potroasted we can have potroasted you can have potroasted they can have potroasted
V-ing perfect
I can have been potroasting you can have been potroasting he can have been potroasting we can have been potroasting you can have been potroasting they can have been potroasting
Negation
Simple form
I cannot potroast you cannot potroast he cannot potroast we cannot potroast you cannot potroast they cannot potroast
V-ing form
I cannot be potroasting you cannot be potroasting he cannot be potroasting we cannot be potroasting you cannot be potroasting they cannot be potroasting
Perfect
I cannot have potroasted you cannot have potroasted he cannot have potroasted we cannot have potroasted you cannot have potroasted they cannot have potroasted
V-ing perfect
I cannot have been potroasting you cannot have been potroasting he cannot have been potroasting we cannot have been potroasting you cannot have been potroasting they cannot have been potroasting
Interrogative form
Simple form
can I potroast? can you potroast? can he potroast? can we potroast? can you potroast? can they potroast?
V-ing form
can I be potroasting? can you be potroasting? can he be potroasting? can we be potroasting? can you be potroasting? can they be potroasting?
Perfect
can I have potroasted? can you have potroasted? can he have potroasted? can we have potroasted? can you have potroasted? can they have potroasted?
V-ing perfect
can I have been potroasting? can you have been potroasting? can he have been potroasting? can we have been potroasting? can you have been potroasting? can they have been potroasting?
Interro-negative form
Simple form
can I not potroast? can you not potroast? can he not potroast? can we not potroast? can you not potroast? can they not potroast?
V-ing form
can I not be potroasting? can you not be potroasting? can he not be potroasting? can we not be potroasting? can you not be potroasting? can they not be potroasting?
Perfect
can I not have potroasted? can you not have potroasted? can he not have potroasted? can we not have potroasted? can you not have potroasted? can they not have potroasted?
V-ing perfect
can I not have been potroasting? can you not have been potroasting? can he not have been potroasting? can we not have been potroasting? can you not have been potroasting? can they not have been potroasting?