English verb conjugation
MUST CURTAIN

Regular verb: curtain - curtained - curtained

Affirmation

Simple form	V-ing form
I must curtain you must curtain he must curtain we must curtain you must curtain they must curtain	I must be curtaining you must be curtaining he must be curtaining we must be curtaining you must be curtaining they must be curtaining
Perfect	V-ing perfect
I must have curtained you must have curtained he must have curtained we must have curtained you must have curtained they must have curtained	I must have been curtaining you must have been curtaining he must have been curtaining we must have been curtaining you must have been curtaining they must have been curtaining

Negation

Simple form	V-ing form
I must not curtain you must not curtain he must not curtain we must not curtain you must not curtain they must not curtain	I must not be curtaining you must not be curtaining he must not be curtaining we must not be curtaining you must not be curtaining they must not be curtaining
Perfect	V-ing perfect
I must not have curtained you must not have curtained he must not have curtained we must not have curtained you must not have curtained they must not have curtained	I must not have been curtaining you must not have been curtaining he must not have been curtaining we must not have been curtaining you must not have been curtaining they must not have been curtaining

Interrogative form

Simple form	V-ing form
must I curtain? must you curtain? must he curtain? must we curtain? must you curtain? must they curtain?	must I be curtaining? must you be curtaining? must he be curtaining? must we be curtaining? must you be curtaining? must they be curtaining?
Perfect	V-ing perfect
must I have curtained? must you have curtained? must he have curtained? must we have curtained? must you have curtained? must they have curtained?	must I have been curtaining? must you have been curtaining? must he have been curtaining? must we have been curtaining? must you have been curtaining? must they have been curtaining?

Interro-negative form

Simple form	V-ing form
must I not curtain? must you not curtain? must he not curtain? must we not curtain? must you not curtain? must they not curtain?	must I not be curtaining? must you not be curtaining? must he not be curtaining? must we not be curtaining? must you not be curtaining? must they not be curtaining?
Perfect	V-ing perfect
must I not have curtained? must you not have curtained? must he not have curtained? must we not have curtained? must you not have curtained? must they not have curtained?	must I not have been curtaining? must you not have been curtaining? must he not have been curtaining? must we not have been curtaining? must you not have been curtaining? must they not have been curtaining?