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