could file
Regular verb: file - filed- filed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could file
you could file
he could file
we could file
you could file
they could file 	I could be filing
you could be filing
he could be filing
we could be filing
you could be filing
they could be filing	I could have filed
you could have filed
he could have filed
we could have filed
you could have filed
they could have filed	I could have been filing
you could have been filing
he could have been filing
we could have been filing
you could have been filing
they could have been filing	

Negation 	
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I couldn't file
you couldn't file
he couldn't file
we couldn't file
you couldn't file
they couldn't file 	I couldn't be filing
you couldn't be filing
he couldn't be filing
we couldn't be filing
you couldn't be filing
they couldn't be filing	I couldn't have filed
you couldn't have filed
he couldn't have filed
we couldn't have filed
you couldn't have filed
they couldn't have filed	I couldn't have been filing
you couldn't have been filing
he couldn't have been filing
we couldn't have been filing
you couldn't have been filing
they couldn't have been filing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I file?
could you file?
could he file?
could we file?
could you file?
could they file? 	could I be filing?
could you be filing?
could he be filing?
could we be filing?
could you be filing?
could they be filing? 	could I have filed?
could you have filed?
could he have filed?
could we have filed?
could you have filed?
could they have filed? 	could I have been filing?
could you have been filing?
could he have been filing?
could we have been filing?
could you have been filing?
could they have been filing? 	

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