English verb conjugation
MUST DESTAIN

Regular verb: destain - destained - destained

Affirmation

Simple form	V-ing form
I must destain you must destain he must destain we must destain you must destain they must destain	I must be destaining you must be destaining he must be destaining we must be destaining you must be destaining they must be destaining
Perfect	V-ing perfect
I must have destained you must have destained he must have destained we must have destained you must have destained they must have destained	I must have been destaining you must have been destaining he must have been destaining we must have been destaining you must have been destaining they must have been destaining

Negation

Simple form	V-ing form
I must not destain you must not destain he must not destain we must not destain you must not destain they must not destain	I must not be destaining you must not be destaining he must not be destaining we must not be destaining you must not be destaining they must not be destaining
Perfect	V-ing perfect
I must not have destained you must not have destained he must not have destained we must not have destained you must not have destained they must not have destained	I must not have been destaining you must not have been destaining he must not have been destaining we must not have been destaining you must not have been destaining they must not have been destaining

Interrogative form

Simple form	V-ing form
must I destain? must you destain? must he destain? must we destain? must you destain? must they destain?	must I be destaining? must you be destaining? must he be destaining? must we be destaining? must you be destaining? must they be destaining?
Perfect	V-ing perfect
must I have destained? must you have destained? must he have destained? must we have destained? must you have destained? must they have destained?	must I have been destaining? must you have been destaining? must he have been destaining? must we have been destaining? must you have been destaining? must they have been destaining?

Interro-negative form

Simple form	V-ing form
must I not destain? must you not destain? must he not destain? must we not destain? must you not destain? must they not destain?	must I not be destaining? must you not be destaining? must he not be destaining? must we not be destaining? must you not be destaining? must they not be destaining?
Perfect	V-ing perfect
must I not have destained? must you not have destained? must he not have destained? must we not have destained? must you not have destained? must they not have destained?	must I not have been destaining? must you not have been destaining? must he not have been destaining? must we not have been destaining? must you not have been destaining? must they not have been destaining?