English verb conjugation
COULD SHEATHE

Regular verb: sheathe - sheathed - sheathed

Affirmation

Simple form	V-ing form
I could sheathe you could sheathe she could sheathe we could sheathe you could sheathe they could sheathe	I could be sheathing you could be sheathing she could be sheathing we could be sheathing you could be sheathing they could be sheathing
Perfect	V-ing perfect
I could have sheathed you could have sheathed she could have sheathed we could have sheathed you could have sheathed they could have sheathed	I could have been sheathing you could have been sheathing she could have been sheathing we could have been sheathing you could have been sheathing they could have been sheathing

Negation

Simple form	V-ing form
I could not sheathe you could not sheathe she could not sheathe we could not sheathe you could not sheathe they could not sheathe	I could not be sheathing you could not be sheathing she could not be sheathing we could not be sheathing you could not be sheathing they could not be sheathing
Perfect	V-ing perfect
I could not have sheathed you could not have sheathed she could not have sheathed we could not have sheathed you could not have sheathed they could not have sheathed	I could not have been sheathing you could not have been sheathing she could not have been sheathing we could not have been sheathing you could not have been sheathing they could not have been sheathing

Interrogative form

Simple form	V-ing form
could I sheathe? could you sheathe? could she sheathe? could we sheathe? could you sheathe? could they sheathe?	could I be sheathing? could you be sheathing? could she be sheathing? could we be sheathing? could you be sheathing? could they be sheathing?
Perfect	V-ing perfect
could I have sheathed? could you have sheathed? could she have sheathed? could we have sheathed? could you have sheathed? could they have sheathed?	could I have been sheathing? could you have been sheathing? could she have been sheathing? could we have been sheathing? could you have been sheathing? could they have been sheathing?

Interro-negative form

Simple form	V-ing form
could I not sheathe? could you not sheathe? could she not sheathe? could we not sheathe? could you not sheathe? could they not sheathe?	could I not be sheathing? could you not be sheathing? could she not be sheathing? could we not be sheathing? could you not be sheathing? could they not be sheathing?
Perfect	V-ing perfect
could I not have sheathed? could you not have sheathed? could she not have sheathed? could we not have sheathed? could you not have sheathed? could they not have sheathed?	could I not have been sheathing? could you not have been sheathing? could she not have been sheathing? could we not have been sheathing? could you not have been sheathing? could they not have been sheathing?