English verb conjugation
MUST SOB

Regular verb: sob - sobbed - sobbed

Affirmation

Simple form	V-ing form
I must sob you must sob he must sob we must sob you must sob they must sob	I must be sobbing you must be sobbing he must be sobbing we must be sobbing you must be sobbing they must be sobbing
Perfect	V-ing perfect
I must have sobbed you must have sobbed he must have sobbed we must have sobbed you must have sobbed they must have sobbed	I must have been sobbing you must have been sobbing he must have been sobbing we must have been sobbing you must have been sobbing they must have been sobbing

Negation

Simple form	V-ing form
I must not sob you must not sob he must not sob we must not sob you must not sob they must not sob	I must not be sobbing you must not be sobbing he must not be sobbing we must not be sobbing you must not be sobbing they must not be sobbing
Perfect	V-ing perfect
I must not have sobbed you must not have sobbed he must not have sobbed we must not have sobbed you must not have sobbed they must not have sobbed	I must not have been sobbing you must not have been sobbing he must not have been sobbing we must not have been sobbing you must not have been sobbing they must not have been sobbing

Interrogative form

Simple form	V-ing form
must I sob? must you sob? must he sob? must we sob? must you sob? must they sob?	must I be sobbing? must you be sobbing? must he be sobbing? must we be sobbing? must you be sobbing? must they be sobbing?
Perfect	V-ing perfect
must I have sobbed? must you have sobbed? must he have sobbed? must we have sobbed? must you have sobbed? must they have sobbed?	must I have been sobbing? must you have been sobbing? must he have been sobbing? must we have been sobbing? must you have been sobbing? must they have been sobbing?

Interro-negative form

Simple form	V-ing form
must I not sob? must you not sob? must he not sob? must we not sob? must you not sob? must they not sob?	must I not be sobbing? must you not be sobbing? must he not be sobbing? must we not be sobbing? must you not be sobbing? must they not be sobbing?
Perfect	V-ing perfect
must I not have sobbed? must you not have sobbed? must he not have sobbed? must we not have sobbed? must you not have sobbed? must they not have sobbed?	must I not have been sobbing? must you not have been sobbing? must he not have been sobbing? must we not have been sobbing? must you not have been sobbing? must they not have been sobbing?