English verb conjugation
MUST UNSHEATHE

Regular verb: unsheathe - unsheathed - unsheathed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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