must sky
Verbo regular: sky - skied- skied

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must sky
you must sky
he must sky
we must sky
you must sky
they must sky 	I must be skying
you must be skying
he must be skying
we must be skying
you must be skying
they must be skying	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 skying
you must have been skying
he must have been skying
we must have been skying
you must have been skying
they must have been skying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't sky
you mustn't sky
he mustn't sky
we mustn't sky
you mustn't sky
they mustn't sky 	I mustn't be skying
you mustn't be skying
he mustn't be skying
we mustn't be skying
you mustn't be skying
they mustn't be skying	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 skying
you mustn't have been skying
he mustn't have been skying
we mustn't have been skying
you mustn't have been skying
they mustn't have been skying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I sky?
must you sky?
must he sky?
must we sky?
must you sky?
must they sky? 	must I be skying?
must you be skying?
must he be skying?
must we be skying?
must you be skying?
must they be skying? 	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 skying?
must you have been skying?
must he have been skying?
must we have been skying?
must you have been skying?
must they have been skying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I sky?
mustn't you sky?
mustn't he sky?
mustn't we sky?
mustn't you sky?
mustn't they sky? 	mustn't I be skying?
mustn't you be skying?
mustn't he be skying?
mustn't we be skying?
mustn't you be skying?
mustn't they be skying? 	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 skying?
mustn't you have been skying?
mustn't he have been skying?
mustn't we have been skying?
mustn't you have been skying?
mustn't they have been skying?