could unsheathe
Regular verb: unsheathe - unsheathed- unsheathed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unsheathe
you could unsheathe
he could unsheathe
we could unsheathe
you could unsheathe
they could unsheathe 	I could be unsheathing
you could be unsheathing
he could be unsheathing
we could be unsheathing
you could be unsheathing
they could be unsheathing	I could have unsheathed
you could have unsheathed
he could have unsheathed
we could have unsheathed
you could have unsheathed
they could have unsheathed	I could have been unsheathing
you could have been unsheathing
he could have been unsheathing
we could have been unsheathing
you could have been unsheathing
they could have been unsheathing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unsheathe
you couldn't unsheathe
he couldn't unsheathe
we couldn't unsheathe
you couldn't unsheathe
they couldn't unsheathe 	I couldn't be unsheathing
you couldn't be unsheathing
he couldn't be unsheathing
we couldn't be unsheathing
you couldn't be unsheathing
they couldn't be unsheathing	I couldn't have unsheathed
you couldn't have unsheathed
he couldn't have unsheathed
we couldn't have unsheathed
you couldn't have unsheathed
they couldn't have unsheathed	I couldn't have been unsheathing
you couldn't have been unsheathing
he couldn't have been unsheathing
we couldn't have been unsheathing
you couldn't have been unsheathing
they couldn't have been unsheathing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unsheathe?
could you unsheathe?
could he unsheathe?
could we unsheathe?
could you unsheathe?
could they unsheathe? 	could I be unsheathing?
could you be unsheathing?
could he be unsheathing?
could we be unsheathing?
could you be unsheathing?
could they be unsheathing? 	could I have unsheathed?
could you have unsheathed?
could he have unsheathed?
could we have unsheathed?
could you have unsheathed?
could they have unsheathed? 	could I have been unsheathing?
could you have been unsheathing?
could he have been unsheathing?
could we have been unsheathing?
could you have been unsheathing?
could they have been unsheathing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unsheathe?
couldn't you unsheathe?
couldn't he unsheathe?
couldn't we unsheathe?
couldn't you unsheathe?
couldn't they unsheathe? 	couldn't I be unsheathing?
couldn't you be unsheathing?
couldn't he be unsheathing?
couldn't we be unsheathing?
couldn't you be unsheathing?
couldn't they be unsheathing? 	couldn't I have unsheathed?
couldn't you have unsheathed?
couldn't he have unsheathed?
couldn't we have unsheathed?
couldn't you have unsheathed?
couldn't they have unsheathed? 	couldn't I have been unsheathing?
couldn't you have been unsheathing?
couldn't he have been unsheathing?
couldn't we have been unsheathing?
couldn't you have been unsheathing?
couldn't they have been unsheathing?