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 must not sight
you must not sight
he must not sight
we must not sight
you must not sight
they must not sight 	I must not be sighting
you must not be sighting
he must not be sighting
we must not be sighting
you must not be sighting
they must not be sighting	I must not have sighted
you must not have sighted
he must not have sighted
we must not have sighted
you must not have sighted
they must not have sighted	I must not have been sighting
you must not have been sighting
he must not have been sighting
we must not have been sighting
you must not have been sighting
they must not 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 	
must I not sight?
must you not sight?
must he not sight?
must we not sight?
must you not sight?
must they not sight? 	must I not be sighting?
must you not be sighting?
must he not be sighting?
must we not be sighting?
must you not be sighting?
must they not be sighting? 	must I not have sighted?
must you not have sighted?
must he not have sighted?
must we not have sighted?
must you not have sighted?
must they not have sighted? 	must I not have been sighting?
must you not have been sighting?
must he not have been sighting?
must we not have been sighting?
must you not have been sighting?
must they not have been sighting?