English verb conjugation
MUST SUNBURN

Regular verb: sunburn - sunburned - sunburned

Affirmation

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