must squall
Regular verb: squall - squalled- squalled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must squall
you must squall
he must squall
we must squall
you must squall
they must squall 	I must be squalling
you must be squalling
he must be squalling
we must be squalling
you must be squalling
they must be squalling	I must have squalled
you must have squalled
he must have squalled
we must have squalled
you must have squalled
they must have squalled	I must have been squalling
you must have been squalling
he must have been squalling
we must have been squalling
you must have been squalling
they must have been squalling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't squall
you mustn't squall
he mustn't squall
we mustn't squall
you mustn't squall
they mustn't squall 	I mustn't be squalling
you mustn't be squalling
he mustn't be squalling
we mustn't be squalling
you mustn't be squalling
they mustn't be squalling	I mustn't have squalled
you mustn't have squalled
he mustn't have squalled
we mustn't have squalled
you mustn't have squalled
they mustn't have squalled	I mustn't have been squalling
you mustn't have been squalling
he mustn't have been squalling
we mustn't have been squalling
you mustn't have been squalling
they mustn't have been squalling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I squall?
must you squall?
must he squall?
must we squall?
must you squall?
must they squall? 	must I be squalling?
must you be squalling?
must he be squalling?
must we be squalling?
must you be squalling?
must they be squalling? 	must I have squalled?
must you have squalled?
must he have squalled?
must we have squalled?
must you have squalled?
must they have squalled? 	must I have been squalling?
must you have been squalling?
must he have been squalling?
must we have been squalling?
must you have been squalling?
must they have been squalling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I squall?
mustn't you squall?
mustn't he squall?
mustn't we squall?
mustn't you squall?
mustn't they squall? 	mustn't I be squalling?
mustn't you be squalling?
mustn't he be squalling?
mustn't we be squalling?
mustn't you be squalling?
mustn't they be squalling? 	mustn't I have squalled?
mustn't you have squalled?
mustn't he have squalled?
mustn't we have squalled?
mustn't you have squalled?
mustn't they have squalled? 	mustn't I have been squalling?
mustn't you have been squalling?
mustn't he have been squalling?
mustn't we have been squalling?
mustn't you have been squalling?
mustn't they have been squalling?