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