could imperil
Regular verb: imperil - imperilled- imperilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could imperil
you could imperil
he could imperil
we could imperil
you could imperil
they could imperil 	I could be imperilling
you could be imperilling
he could be imperilling
we could be imperilling
you could be imperilling
they could be imperilling	I could have imperilled
you could have imperilled
he could have imperilled
we could have imperilled
you could have imperilled
they could have imperilled	I could have been imperilling
you could have been imperilling
he could have been imperilling
we could have been imperilling
you could have been imperilling
they could have been imperilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't imperil
you couldn't imperil
he couldn't imperil
we couldn't imperil
you couldn't imperil
they couldn't imperil 	I couldn't be imperilling
you couldn't be imperilling
he couldn't be imperilling
we couldn't be imperilling
you couldn't be imperilling
they couldn't be imperilling	I couldn't have imperilled
you couldn't have imperilled
he couldn't have imperilled
we couldn't have imperilled
you couldn't have imperilled
they couldn't have imperilled	I couldn't have been imperilling
you couldn't have been imperilling
he couldn't have been imperilling
we couldn't have been imperilling
you couldn't have been imperilling
they couldn't have been imperilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I imperil?
could you imperil?
could he imperil?
could we imperil?
could you imperil?
could they imperil? 	could I be imperilling?
could you be imperilling?
could he be imperilling?
could we be imperilling?
could you be imperilling?
could they be imperilling? 	could I have imperilled?
could you have imperilled?
could he have imperilled?
could we have imperilled?
could you have imperilled?
could they have imperilled? 	could I have been imperilling?
could you have been imperilling?
could he have been imperilling?
could we have been imperilling?
could you have been imperilling?
could they have been imperilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I imperil?
couldn't you imperil?
couldn't he imperil?
couldn't we imperil?
couldn't you imperil?
couldn't they imperil? 	couldn't I be imperilling?
couldn't you be imperilling?
couldn't he be imperilling?
couldn't we be imperilling?
couldn't you be imperilling?
couldn't they be imperilling? 	couldn't I have imperilled?
couldn't you have imperilled?
couldn't he have imperilled?
couldn't we have imperilled?
couldn't you have imperilled?
couldn't they have imperilled? 	couldn't I have been imperilling?
couldn't you have been imperilling?
couldn't he have been imperilling?
couldn't we have been imperilling?
couldn't you have been imperilling?
couldn't they have been imperilling?