English verb conjugation
MUST SUBSTITUTE

Regular verb: substitute - substituted - substituted

Affirmation

Simple form	V-ing form
I must substitute you must substitute she must substitute we must substitute you must substitute they must substitute	I must be substituting you must be substituting she must be substituting we must be substituting you must be substituting they must be substituting
Perfect	V-ing perfect
I must have substituted you must have substituted she must have substituted we must have substituted you must have substituted they must have substituted	I must have been substituting you must have been substituting she must have been substituting we must have been substituting you must have been substituting they must have been substituting

Negation

Simple form	V-ing form
I mustn't substitute you mustn't substitute she mustn't substitute we mustn't substitute you mustn't substitute they mustn't substitute	I mustn't be substituting you mustn't be substituting she mustn't be substituting we mustn't be substituting you mustn't be substituting they mustn't be substituting
Perfect	V-ing perfect
I mustn't have substituted you mustn't have substituted she mustn't have substituted we mustn't have substituted you mustn't have substituted they mustn't have substituted	I mustn't have been substituting you mustn't have been substituting she mustn't have been substituting we mustn't have been substituting you mustn't have been substituting they mustn't have been substituting

Interrogative form

Simple form	V-ing form
must I substitute? must you substitute? must she substitute? must we substitute? must you substitute? must they substitute?	must I be substituting? must you be substituting? must she be substituting? must we be substituting? must you be substituting? must they be substituting?
Perfect	V-ing perfect
must I have substituted? must you have substituted? must she have substituted? must we have substituted? must you have substituted? must they have substituted?	must I have been substituting? must you have been substituting? must she have been substituting? must we have been substituting? must you have been substituting? must they have been substituting?

Interro-negative form

Simple form	V-ing form
mustn't I substitute? mustn't you substitute? mustn't she substitute? mustn't we substitute? mustn't you substitute? mustn't they substitute?	mustn't I be substituting? mustn't you be substituting? mustn't she be substituting? mustn't we be substituting? mustn't you be substituting? mustn't they be substituting?
Perfect	V-ing perfect
mustn't I have substituted? mustn't you have substituted? mustn't she have substituted? mustn't we have substituted? mustn't you have substituted? mustn't they have substituted?	mustn't I have been substituting? mustn't you have been substituting? mustn't she have been substituting? mustn't we have been substituting? mustn't you have been substituting? mustn't they have been substituting?