I can shadowbox you can shadowbox he can shadowbox we can shadowbox you can shadowbox they can shadowbox
V-ing form
I can be shadowboxing you can be shadowboxing he can be shadowboxing we can be shadowboxing you can be shadowboxing they can be shadowboxing
Perfect
I can have shadowboxed you can have shadowboxed he can have shadowboxed we can have shadowboxed you can have shadowboxed they can have shadowboxed
V-ing perfect
I can have been shadowboxing you can have been shadowboxing he can have been shadowboxing we can have been shadowboxing you can have been shadowboxing they can have been shadowboxing
Negation
Simple form
I can't shadowbox you can't shadowbox he can't shadowbox we can't shadowbox you can't shadowbox they can't shadowbox
V-ing form
I can't be shadowboxing you can't be shadowboxing he can't be shadowboxing we can't be shadowboxing you can't be shadowboxing they can't be shadowboxing
Perfect
I can't have shadowboxed you can't have shadowboxed he can't have shadowboxed we can't have shadowboxed you can't have shadowboxed they can't have shadowboxed
V-ing perfect
I can't have been shadowboxing you can't have been shadowboxing he can't have been shadowboxing we can't have been shadowboxing you can't have been shadowboxing they can't have been shadowboxing
Interrogative form
Simple form
can I shadowbox? can you shadowbox? can he shadowbox? can we shadowbox? can you shadowbox? can they shadowbox?
V-ing form
can I be shadowboxing? can you be shadowboxing? can he be shadowboxing? can we be shadowboxing? can you be shadowboxing? can they be shadowboxing?
Perfect
can I have shadowboxed? can you have shadowboxed? can he have shadowboxed? can we have shadowboxed? can you have shadowboxed? can they have shadowboxed?
V-ing perfect
can I have been shadowboxing? can you have been shadowboxing? can he have been shadowboxing? can we have been shadowboxing? can you have been shadowboxing? can they have been shadowboxing?
Interro-negative form
Simple form
can't I shadowbox? can't you shadowbox? can't he shadowbox? can't we shadowbox? can't you shadowbox? can't they shadowbox?
V-ing form
can't I be shadowboxing? can't you be shadowboxing? can't he be shadowboxing? can't we be shadowboxing? can't you be shadowboxing? can't they be shadowboxing?
Perfect
can't I have shadowboxed? can't you have shadowboxed? can't he have shadowboxed? can't we have shadowboxed? can't you have shadowboxed? can't they have shadowboxed?
V-ing perfect
can't I have been shadowboxing? can't you have been shadowboxing? can't he have been shadowboxing? can't we have been shadowboxing? can't you have been shadowboxing? can't they have been shadowboxing?