I must lie you must lie he must lie we must lie you must lie they must lie
V-ing form
I must be lying you must be lying he must be lying we must be lying you must be lying they must be lying
Perfect
I must have lain you must have lain he must have lain we must have lain you must have lain they must have lain
V-ing perfect
I must have been lying you must have been lying he must have been lying we must have been lying you must have been lying they must have been lying
Negation
Simple form
I must not lie you must not lie he must not lie we must not lie you must not lie they must not lie
V-ing form
I must not be lying you must not be lying he must not be lying we must not be lying you must not be lying they must not be lying
Perfect
I must not have lain you must not have lain he must not have lain we must not have lain you must not have lain they must not have lain
V-ing perfect
I must not have been lying you must not have been lying he must not have been lying we must not have been lying you must not have been lying they must not have been lying
Interrogative form
Simple form
must I lie? must you lie? must he lie? must we lie? must you lie? must they lie?
V-ing form
must I be lying? must you be lying? must he be lying? must we be lying? must you be lying? must they be lying?
Perfect
must I have lain? must you have lain? must he have lain? must we have lain? must you have lain? must they have lain?
V-ing perfect
must I have been lying? must you have been lying? must he have been lying? must we have been lying? must you have been lying? must they have been lying?
Interro-negative form
Simple form
must I not lie? must you not lie? must he not lie? must we not lie? must you not lie? must they not lie?
V-ing form
must I not be lying? must you not be lying? must he not be lying? must we not be lying? must you not be lying? must they not be lying?
Perfect
must I not have lain? must you not have lain? must he not have lain? must we not have lain? must you not have lain? must they not have lain?
V-ing perfect
must I not have been lying? must you not have been lying? must he not have been lying? must we not have been lying? must you not have been lying? must they not have been lying?