must spiral
Regular verb: spiral - spiralled- spiralled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't spiral
you mustn't spiral
he mustn't spiral
we mustn't spiral
you mustn't spiral
they mustn't spiral 	I mustn't be spiralling
you mustn't be spiralling
he mustn't be spiralling
we mustn't be spiralling
you mustn't be spiralling
they mustn't be spiralling	I mustn't have spiralled
you mustn't have spiralled
he mustn't have spiralled
we mustn't have spiralled
you mustn't have spiralled
they mustn't have spiralled	I mustn't have been spiralling
you mustn't have been spiralling
he mustn't have been spiralling
we mustn't have been spiralling
you mustn't have been spiralling
they mustn't have been spiralling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I spiral?
mustn't you spiral?
mustn't he spiral?
mustn't we spiral?
mustn't you spiral?
mustn't they spiral? 	mustn't I be spiralling?
mustn't you be spiralling?
mustn't he be spiralling?
mustn't we be spiralling?
mustn't you be spiralling?
mustn't they be spiralling? 	mustn't I have spiralled?
mustn't you have spiralled?
mustn't he have spiralled?
mustn't we have spiralled?
mustn't you have spiralled?
mustn't they have spiralled? 	mustn't I have been spiralling?
mustn't you have been spiralling?
mustn't he have been spiralling?
mustn't we have been spiralling?
mustn't you have been spiralling?
mustn't they have been spiralling?