must sight
Verbo regular: sight - sighted- sighted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must sight
you must sight
he must sight
we must sight
you must sight
they must sight 	I must be sighting
you must be sighting
he must be sighting
we must be sighting
you must be sighting
they must be sighting	I must have sighted
you must have sighted
he must have sighted
we must have sighted
you must have sighted
they must have sighted	I must have been sighting
you must have been sighting
he must have been sighting
we must have been sighting
you must have been sighting
they must have been sighting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't sight
you mustn't sight
he mustn't sight
we mustn't sight
you mustn't sight
they mustn't sight 	I mustn't be sighting
you mustn't be sighting
he mustn't be sighting
we mustn't be sighting
you mustn't be sighting
they mustn't be sighting	I mustn't have sighted
you mustn't have sighted
he mustn't have sighted
we mustn't have sighted
you mustn't have sighted
they mustn't have sighted	I mustn't have been sighting
you mustn't have been sighting
he mustn't have been sighting
we mustn't have been sighting
you mustn't have been sighting
they mustn't have been sighting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I sight?
must you sight?
must he sight?
must we sight?
must you sight?
must they sight? 	must I be sighting?
must you be sighting?
must he be sighting?
must we be sighting?
must you be sighting?
must they be sighting? 	must I have sighted?
must you have sighted?
must he have sighted?
must we have sighted?
must you have sighted?
must they have sighted? 	must I have been sighting?
must you have been sighting?
must he have been sighting?
must we have been sighting?
must you have been sighting?
must they have been sighting? 	

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