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