Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must sough sough you must sough sough he must sough sough we must sough sough you must sough sough they must sough sough
V-ing form
I must be sough soughing you must be sough soughing he must be sough soughing we must be sough soughing you must be sough soughing they must be sough soughing
Perfect
I must have sough soughed you must have sough soughed he must have sough soughed we must have sough soughed you must have sough soughed they must have sough soughed
V-ing perfect
I must have been sough soughing you must have been sough soughing he must have been sough soughing we must have been sough soughing you must have been sough soughing they must have been sough soughing
Negation
Simple form
I must not sough sough you must not sough sough he must not sough sough we must not sough sough you must not sough sough they must not sough sough
V-ing form
I must not be sough soughing you must not be sough soughing he must not be sough soughing we must not be sough soughing you must not be sough soughing they must not be sough soughing
Perfect
I must not have sough soughed you must not have sough soughed he must not have sough soughed we must not have sough soughed you must not have sough soughed they must not have sough soughed
V-ing perfect
I must not have been sough soughing you must not have been sough soughing he must not have been sough soughing we must not have been sough soughing you must not have been sough soughing they must not have been sough soughing
Interrogative form
Simple form
must I sough sough? must you sough sough? must he sough sough? must we sough sough? must you sough sough? must they sough sough?
V-ing form
must I be sough soughing? must you be sough soughing? must he be sough soughing? must we be sough soughing? must you be sough soughing? must they be sough soughing?
Perfect
must I have sough soughed? must you have sough soughed? must he have sough soughed? must we have sough soughed? must you have sough soughed? must they have sough soughed?
V-ing perfect
must I have been sough soughing? must you have been sough soughing? must he have been sough soughing? must we have been sough soughing? must you have been sough soughing? must they have been sough soughing?
Interro-negative form
Simple form
must I not sough sough? must you not sough sough? must he not sough sough? must we not sough sough? must you not sough sough? must they not sough sough?
V-ing form
must I not be sough soughing? must you not be sough soughing? must he not be sough soughing? must we not be sough soughing? must you not be sough soughing? must they not be sough soughing?
Perfect
must I not have sough soughed? must you not have sough soughed? must he not have sough soughed? must we not have sough soughed? must you not have sough soughed? must they not have sough soughed?
V-ing perfect
must I not have been sough soughing? must you not have been sough soughing? must he not have been sough soughing? must we not have been sough soughing? must you not have been sough soughing? must they not have been sough soughing?