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