English verb conjugation
MUST SKI SKI

Regular verb: ski ski - ski skied - ski skied

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing 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	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	V-ing 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	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	V-ing form
I mustn't ski ski you mustn't ski ski he mustn't ski ski we mustn't ski ski you mustn't ski ski they mustn't ski ski	I mustn't be ski skiing you mustn't be ski skiing he mustn't be ski skiing we mustn't be ski skiing you mustn't be ski skiing they mustn't be ski skiing
Perfect	V-ing perfect
I mustn't have ski skied you mustn't have ski skied he mustn't have ski skied we mustn't have ski skied you mustn't have ski skied they mustn't have ski skied	I mustn't have been ski skiing you mustn't have been ski skiing he mustn't have been ski skiing we mustn't have been ski skiing you mustn't have been ski skiing they mustn't have been ski skiing

Interrogative form

Simple form	V-ing 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?	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	V-ing 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?	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	V-ing form
mustn't I ski ski? mustn't you ski ski? mustn't he ski ski? mustn't we ski ski? mustn't you ski ski? mustn't they ski ski?	mustn't I be ski skiing? mustn't you be ski skiing? mustn't he be ski skiing? mustn't we be ski skiing? mustn't you be ski skiing? mustn't they be ski skiing?
Perfect	V-ing perfect
mustn't I have ski skied? mustn't you have ski skied? mustn't he have ski skied? mustn't we have ski skied? mustn't you have ski skied? mustn't they have ski skied?	mustn't I have been ski skiing? mustn't you have been ski skiing? mustn't he have been ski skiing? mustn't we have been ski skiing? mustn't you have been ski skiing? mustn't they have been ski skiing?