must light
Irregular verb: light - lit- lit

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must light
you must light
he must light
we must light
you must light
they must light 	I must be lighting
you must be lighting
he must be lighting
we must be lighting
you must be lighting
they must be lighting	I must have lit
you must have lit
he must have lit
we must have lit
you must have lit
they must have lit	I must have been lighting
you must have been lighting
he must have been lighting
we must have been lighting
you must have been lighting
they must have been lighting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't light
you mustn't light
he mustn't light
we mustn't light
you mustn't light
they mustn't light 	I mustn't be lighting
you mustn't be lighting
he mustn't be lighting
we mustn't be lighting
you mustn't be lighting
they mustn't be lighting	I mustn't have lit
you mustn't have lit
he mustn't have lit
we mustn't have lit
you mustn't have lit
they mustn't have lit	I mustn't have been lighting
you mustn't have been lighting
he mustn't have been lighting
we mustn't have been lighting
you mustn't have been lighting
they mustn't have been lighting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I light?
must you light?
must he light?
must we light?
must you light?
must they light? 	must I be lighting?
must you be lighting?
must he be lighting?
must we be lighting?
must you be lighting?
must they be lighting? 	must I have lit?
must you have lit?
must he have lit?
must we have lit?
must you have lit?
must they have lit? 	must I have been lighting?
must you have been lighting?
must he have been lighting?
must we have been lighting?
must you have been lighting?
must they have been lighting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I light?
mustn't you light?
mustn't he light?
mustn't we light?
mustn't you light?
mustn't they light? 	mustn't I be lighting?
mustn't you be lighting?
mustn't he be lighting?
mustn't we be lighting?
mustn't you be lighting?
mustn't they be lighting? 	mustn't I have lit?
mustn't you have lit?
mustn't he have lit?
mustn't we have lit?
mustn't you have lit?
mustn't they have lit? 	mustn't I have been lighting?
mustn't you have been lighting?
mustn't he have been lighting?
mustn't we have been lighting?
mustn't you have been lighting?
mustn't they have been lighting?