I can file you can file he can file we can file you can file they can file
V-ing form
I can be filing you can be filing he can be filing we can be filing you can be filing they can be filing
Perfect
I can have filed you can have filed he can have filed we can have filed you can have filed they can have filed
V-ing perfect
I can have been filing you can have been filing he can have been filing we can have been filing you can have been filing they can have been filing
Negation
Simple form
I can't file you can't file he can't file we can't file you can't file they can't file
V-ing form
I can't be filing you can't be filing he can't be filing we can't be filing you can't be filing they can't be filing
Perfect
I can't have filed you can't have filed he can't have filed we can't have filed you can't have filed they can't have filed
V-ing perfect
I can't have been filing you can't have been filing he can't have been filing we can't have been filing you can't have been filing they can't have been filing
Interrogative form
Simple form
can I file? can you file? can he file? can we file? can you file? can they file?
V-ing form
can I be filing? can you be filing? can he be filing? can we be filing? can you be filing? can they be filing?
Perfect
can I have filed? can you have filed? can he have filed? can we have filed? can you have filed? can they have filed?
V-ing perfect
can I have been filing? can you have been filing? can he have been filing? can we have been filing? can you have been filing? can they have been filing?
Interro-negative form
Simple form
can't I file? can't you file? can't he file? can't we file? can't you file? can't they file?
V-ing form
can't I be filing? can't you be filing? can't he be filing? can't we be filing? can't you be filing? can't they be filing?
Perfect
can't I have filed? can't you have filed? can't he have filed? can't we have filed? can't you have filed? can't they have filed?
V-ing perfect
can't I have been filing? can't you have been filing? can't he have been filing? can't we have been filing? can't you have been filing? can't they have been filing?