must ski
Verbe régulier : ski - skied- skied
Traduction française : faire du ski - descendre en ski 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must ski
you must ski
he must ski
we must ski
you must ski
they must ski 	I must be skiing
you must be skiing
he must be skiing
we must be skiing
you must be skiing
they must be skiing	I must have skied
you must have skied
he must have skied
we must have skied
you must have skied
they must have skied	I must have been skiing
you must have been skiing
he must have been skiing
we must have been skiing
you must have been skiing
they must have been skiing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't ski
you mustn't ski
he mustn't ski
we mustn't ski
you mustn't ski
they mustn't ski 	I mustn't be skiing
you mustn't be skiing
he mustn't be skiing
we mustn't be skiing
you mustn't be skiing
they mustn't be skiing	I mustn't have skied
you mustn't have skied
he mustn't have skied
we mustn't have skied
you mustn't have skied
they mustn't have skied	I mustn't have been skiing
you mustn't have been skiing
he mustn't have been skiing
we mustn't have been skiing
you mustn't have been skiing
they mustn't have been skiing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I ski?
must you ski?
must he ski?
must we ski?
must you ski?
must they ski? 	must I be skiing?
must you be skiing?
must he be skiing?
must we be skiing?
must you be skiing?
must they be skiing? 	must I have skied?
must you have skied?
must he have skied?
must we have skied?
must you have skied?
must they have skied? 	must I have been skiing?
must you have been skiing?
must he have been skiing?
must we have been skiing?
must you have been skiing?
must they have been skiing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I ski?
mustn't you ski?
mustn't he ski?
mustn't we ski?
mustn't you ski?
mustn't they ski? 	mustn't I be skiing?
mustn't you be skiing?
mustn't he be skiing?
mustn't we be skiing?
mustn't you be skiing?
mustn't they be skiing? 	mustn't I have skied?
mustn't you have skied?
mustn't he have skied?
mustn't we have skied?
mustn't you have skied?
mustn't they have skied? 	mustn't I have been skiing?
mustn't you have been skiing?
mustn't he have been skiing?
mustn't we have been skiing?
mustn't you have been skiing?
mustn't they have been skiing?