English verb conjugation
MUST GRAY

Regular verb: gray - grayed - grayed

Affirmation

Simple form	V-ing form
I must gray you must gray he must gray we must gray you must gray they must gray	I must be graying you must be graying he must be graying we must be graying you must be graying they must be graying
Perfect	V-ing perfect
I must have grayed you must have grayed he must have grayed we must have grayed you must have grayed they must have grayed	I must have been graying you must have been graying he must have been graying we must have been graying you must have been graying they must have been graying

Negation

Simple form	V-ing form
I must not gray you must not gray he must not gray we must not gray you must not gray they must not gray	I must not be graying you must not be graying he must not be graying we must not be graying you must not be graying they must not be graying
Perfect	V-ing perfect
I must not have grayed you must not have grayed he must not have grayed we must not have grayed you must not have grayed they must not have grayed	I must not have been graying you must not have been graying he must not have been graying we must not have been graying you must not have been graying they must not have been graying

Interrogative form

Simple form	V-ing form
must I gray? must you gray? must he gray? must we gray? must you gray? must they gray?	must I be graying? must you be graying? must he be graying? must we be graying? must you be graying? must they be graying?
Perfect	V-ing perfect
must I have grayed? must you have grayed? must he have grayed? must we have grayed? must you have grayed? must they have grayed?	must I have been graying? must you have been graying? must he have been graying? must we have been graying? must you have been graying? must they have been graying?

Interro-negative form

Simple form	V-ing form
must I not gray? must you not gray? must he not gray? must we not gray? must you not gray? must they not gray?	must I not be graying? must you not be graying? must he not be graying? must we not be graying? must you not be graying? must they not be graying?
Perfect	V-ing perfect
must I not have grayed? must you not have grayed? must he not have grayed? must we not have grayed? must you not have grayed? must they not have grayed?	must I not have been graying? must you not have been graying? must he not have been graying? must we not have been graying? must you not have been graying? must they not have been graying?