must sunburn
Regular verb: sunburn - sunburned- sunburned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sunburn
you must sunburn
he must sunburn
we must sunburn
you must sunburn
they must sunburn 	I must be sunburning
you must be sunburning
he must be sunburning
we must be sunburning
you must be sunburning
they must be sunburning	I must have sunburned
you must have sunburned
he must have sunburned
we must have sunburned
you must have sunburned
they must have sunburned	I must have been sunburning
you must have been sunburning
he must have been sunburning
we must have been sunburning
you must have been sunburning
they must have been sunburning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not sunburn
you must not sunburn
he must not sunburn
we must not sunburn
you must not sunburn
they must not sunburn 	I must not be sunburning
you must not be sunburning
he must not be sunburning
we must not be sunburning
you must not be sunburning
they must not be sunburning	I must not have sunburned
you must not have sunburned
he must not have sunburned
we must not have sunburned
you must not have sunburned
they must not have sunburned	I must not have been sunburning
you must not have been sunburning
he must not have been sunburning
we must not have been sunburning
you must not have been sunburning
they must not have been sunburning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sunburn?
must you sunburn?
must he sunburn?
must we sunburn?
must you sunburn?
must they sunburn? 	must I be sunburning?
must you be sunburning?
must he be sunburning?
must we be sunburning?
must you be sunburning?
must they be sunburning? 	must I have sunburned?
must you have sunburned?
must he have sunburned?
must we have sunburned?
must you have sunburned?
must they have sunburned? 	must I have been sunburning?
must you have been sunburning?
must he have been sunburning?
must we have been sunburning?
must you have been sunburning?
must they have been sunburning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not sunburn?
must you not sunburn?
must he not sunburn?
must we not sunburn?
must you not sunburn?
must they not sunburn? 	must I not be sunburning?
must you not be sunburning?
must he not be sunburning?
must we not be sunburning?
must you not be sunburning?
must they not be sunburning? 	must I not have sunburned?
must you not have sunburned?
must he not have sunburned?
must we not have sunburned?
must you not have sunburned?
must they not have sunburned? 	must I not have been sunburning?
must you not have been sunburning?
must he not have been sunburning?
must we not have been sunburning?
must you not have been sunburning?
must they not have been sunburning?