English verb conjugation
MUST GUESS

Regular verb: guess - guessed - guessed

Affirmation

Simple form	V-ing form
I must guess you must guess she must guess we must guess you must guess they must guess	I must be guessing you must be guessing she must be guessing we must be guessing you must be guessing they must be guessing
Perfect	V-ing perfect
I must have guessed you must have guessed she must have guessed we must have guessed you must have guessed they must have guessed	I must have been guessing you must have been guessing she must have been guessing we must have been guessing you must have been guessing they must have been guessing

Negation

Simple form	V-ing form
I must not guess you must not guess she must not guess we must not guess you must not guess they must not guess	I must not be guessing you must not be guessing she must not be guessing we must not be guessing you must not be guessing they must not be guessing
Perfect	V-ing perfect
I must not have guessed you must not have guessed she must not have guessed we must not have guessed you must not have guessed they must not have guessed	I must not have been guessing you must not have been guessing she must not have been guessing we must not have been guessing you must not have been guessing they must not have been guessing

Interrogative form

Simple form	V-ing form
must I guess? must you guess? must she guess? must we guess? must you guess? must they guess?	must I be guessing? must you be guessing? must she be guessing? must we be guessing? must you be guessing? must they be guessing?
Perfect	V-ing perfect
must I have guessed? must you have guessed? must she have guessed? must we have guessed? must you have guessed? must they have guessed?	must I have been guessing? must you have been guessing? must she have been guessing? must we have been guessing? must you have been guessing? must they have been guessing?

Interro-negative form

Simple form	V-ing form
must I not guess? must you not guess? must she not guess? must we not guess? must you not guess? must they not guess?	must I not be guessing? must you not be guessing? must she not be guessing? must we not be guessing? must you not be guessing? must they not be guessing?
Perfect	V-ing perfect
must I not have guessed? must you not have guessed? must she not have guessed? must we not have guessed? must you not have guessed? must they not have guessed?	must I not have been guessing? must you not have been guessing? must she not have been guessing? must we not have been guessing? must you not have been guessing? must they not have been guessing?