English verb conjugation
MUST SHEATHE

Regular verb: sheathe - sheathed - sheathed

Affirmation

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

Negation

Simple form	V-ing form
I mustn't sheathe you mustn't sheathe she mustn't sheathe we mustn't sheathe you mustn't sheathe they mustn't sheathe	I mustn't be sheathing you mustn't be sheathing she mustn't be sheathing we mustn't be sheathing you mustn't be sheathing they mustn't be sheathing
Perfect	V-ing perfect
I mustn't have sheathed you mustn't have sheathed she mustn't have sheathed we mustn't have sheathed you mustn't have sheathed they mustn't have sheathed	I mustn't have been sheathing you mustn't have been sheathing she mustn't have been sheathing we mustn't have been sheathing you mustn't have been sheathing they mustn't have been sheathing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
mustn't I sheathe? mustn't you sheathe? mustn't she sheathe? mustn't we sheathe? mustn't you sheathe? mustn't they sheathe?	mustn't I be sheathing? mustn't you be sheathing? mustn't she be sheathing? mustn't we be sheathing? mustn't you be sheathing? mustn't they be sheathing?
Perfect	V-ing perfect
mustn't I have sheathed? mustn't you have sheathed? mustn't she have sheathed? mustn't we have sheathed? mustn't you have sheathed? mustn't they have sheathed?	mustn't I have been sheathing? mustn't you have been sheathing? mustn't she have been sheathing? mustn't we have been sheathing? mustn't you have been sheathing? mustn't they have been sheathing?