English verb conjugation
CAN FILE

Regular verb: file - filed - filed

Affirmation

Simple form	V-ing form
I can file you can file he can file we can file you can file they can file	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
can I file? can you file? can he file? can we file? can you file? can they file?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?