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 must not light
you must not light
he must not light
we must not light
you must not light
they must not light 	I must not be lighting
you must not be lighting
he must not be lighting
we must not be lighting
you must not be lighting
they must not be lighting	I must not have lit
you must not have lit
he must not have lit
we must not have lit
you must not have lit
they must not have lit	I must not have been lighting
you must not have been lighting
he must not have been lighting
we must not have been lighting
you must not have been lighting
they must not 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 	
must I not light?
must you not light?
must he not light?
must we not light?
must you not light?
must they not light? 	must I not be lighting?
must you not be lighting?
must he not be lighting?
must we not be lighting?
must you not be lighting?
must they not be lighting? 	must I not have lit?
must you not have lit?
must he not have lit?
must we not have lit?
must you not have lit?
must they not have lit? 	must I not have been lighting?
must you not have been lighting?
must he not have been lighting?
must we not have been lighting?
must you not have been lighting?
must they not have been lighting?