must spiral
Verbo regular: spiral - spiralled- spiralled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must spiral
you must spiral
he must spiral
we must spiral
you must spiral
they must spiral 	I must be spiralling
you must be spiralling
he must be spiralling
we must be spiralling
you must be spiralling
they must be spiralling	I must have spiralled
you must have spiralled
he must have spiralled
we must have spiralled
you must have spiralled
they must have spiralled	I must have been spiralling
you must have been spiralling
he must have been spiralling
we must have been spiralling
you must have been spiralling
they must have been spiralling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not spiral
you must not spiral
he must not spiral
we must not spiral
you must not spiral
they must not spiral 	I must not be spiralling
you must not be spiralling
he must not be spiralling
we must not be spiralling
you must not be spiralling
they must not be spiralling	I must not have spiralled
you must not have spiralled
he must not have spiralled
we must not have spiralled
you must not have spiralled
they must not have spiralled	I must not have been spiralling
you must not have been spiralling
he must not have been spiralling
we must not have been spiralling
you must not have been spiralling
they must not have been spiralling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I spiral?
must you spiral?
must he spiral?
must we spiral?
must you spiral?
must they spiral? 	must I be spiralling?
must you be spiralling?
must he be spiralling?
must we be spiralling?
must you be spiralling?
must they be spiralling? 	must I have spiralled?
must you have spiralled?
must he have spiralled?
must we have spiralled?
must you have spiralled?
must they have spiralled? 	must I have been spiralling?
must you have been spiralling?
must he have been spiralling?
must we have been spiralling?
must you have been spiralling?
must they have been spiralling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not spiral?
must you not spiral?
must he not spiral?
must we not spiral?
must you not spiral?
must they not spiral? 	must I not be spiralling?
must you not be spiralling?
must he not be spiralling?
must we not be spiralling?
must you not be spiralling?
must they not be spiralling? 	must I not have spiralled?
must you not have spiralled?
must he not have spiralled?
must we not have spiralled?
must you not have spiralled?
must they not have spiralled? 	must I not have been spiralling?
must you not have been spiralling?
must he not have been spiralling?
must we not have been spiralling?
must you not have been spiralling?
must they not have been spiralling?