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 mustn't sunburn you mustn't sunburn she mustn't sunburn we mustn't sunburn you mustn't sunburn they mustn't sunburn	I mustn't be sunburning you mustn't be sunburning she mustn't be sunburning we mustn't be sunburning you mustn't be sunburning they mustn't be sunburning
Perfect	V-ing perfect
I mustn't have sunburned you mustn't have sunburned she mustn't have sunburned we mustn't have sunburned you mustn't have sunburned they mustn't have sunburned	I mustn't have been sunburning you mustn't have been sunburning she mustn't have been sunburning we mustn't have been sunburning you mustn't have been sunburning they mustn't 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
mustn't I sunburn? mustn't you sunburn? mustn't she sunburn? mustn't we sunburn? mustn't you sunburn? mustn't they sunburn?	mustn't I be sunburning? mustn't you be sunburning? mustn't she be sunburning? mustn't we be sunburning? mustn't you be sunburning? mustn't they be sunburning?
Perfect	V-ing perfect
mustn't I have sunburned? mustn't you have sunburned? mustn't she have sunburned? mustn't we have sunburned? mustn't you have sunburned? mustn't they have sunburned?	mustn't I have been sunburning? mustn't you have been sunburning? mustn't she have been sunburning? mustn't we have been sunburning? mustn't you have been sunburning? mustn't they have been sunburning?