must squint
Regular verb: squint - squinted- squinted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must squint
you must squint
he must squint
we must squint
you must squint
they must squint 	I must be squinting
you must be squinting
he must be squinting
we must be squinting
you must be squinting
they must be squinting	I must have squinted
you must have squinted
he must have squinted
we must have squinted
you must have squinted
they must have squinted	I must have been squinting
you must have been squinting
he must have been squinting
we must have been squinting
you must have been squinting
they must have been squinting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't squint
you mustn't squint
he mustn't squint
we mustn't squint
you mustn't squint
they mustn't squint 	I mustn't be squinting
you mustn't be squinting
he mustn't be squinting
we mustn't be squinting
you mustn't be squinting
they mustn't be squinting	I mustn't have squinted
you mustn't have squinted
he mustn't have squinted
we mustn't have squinted
you mustn't have squinted
they mustn't have squinted	I mustn't have been squinting
you mustn't have been squinting
he mustn't have been squinting
we mustn't have been squinting
you mustn't have been squinting
they mustn't have been squinting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I squint?
must you squint?
must he squint?
must we squint?
must you squint?
must they squint? 	must I be squinting?
must you be squinting?
must he be squinting?
must we be squinting?
must you be squinting?
must they be squinting? 	must I have squinted?
must you have squinted?
must he have squinted?
must we have squinted?
must you have squinted?
must they have squinted? 	must I have been squinting?
must you have been squinting?
must he have been squinting?
must we have been squinting?
must you have been squinting?
must they have been squinting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I squint?
mustn't you squint?
mustn't he squint?
mustn't we squint?
mustn't you squint?
mustn't they squint? 	mustn't I be squinting?
mustn't you be squinting?
mustn't he be squinting?
mustn't we be squinting?
mustn't you be squinting?
mustn't they be squinting? 	mustn't I have squinted?
mustn't you have squinted?
mustn't he have squinted?
mustn't we have squinted?
mustn't you have squinted?
mustn't they have squinted? 	mustn't I have been squinting?
mustn't you have been squinting?
mustn't he have been squinting?
mustn't we have been squinting?
mustn't you have been squinting?
mustn't they have been squinting?