English verb conjugation
COULD UNSHEATHE

Regular verb: unsheathe - unsheathed - unsheathed

Affirmation

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