I must upset you must upset he must upset we must upset you must upset they must upset
V-ing form
I must be upsetting you must be upsetting he must be upsetting we must be upsetting you must be upsetting they must be upsetting
Perfect
I must have upset you must have upset he must have upset we must have upset you must have upset they must have upset
V-ing perfect
I must have been upsetting you must have been upsetting he must have been upsetting we must have been upsetting you must have been upsetting they must have been upsetting
Negation
Simple form
I mustn't upset you mustn't upset he mustn't upset we mustn't upset you mustn't upset they mustn't upset
V-ing form
I mustn't be upsetting you mustn't be upsetting he mustn't be upsetting we mustn't be upsetting you mustn't be upsetting they mustn't be upsetting
Perfect
I mustn't have upset you mustn't have upset he mustn't have upset we mustn't have upset you mustn't have upset they mustn't have upset
V-ing perfect
I mustn't have been upsetting you mustn't have been upsetting he mustn't have been upsetting we mustn't have been upsetting you mustn't have been upsetting they mustn't have been upsetting
Interrogative form
Simple form
must I upset? must you upset? must he upset? must we upset? must you upset? must they upset?
V-ing form
must I be upsetting? must you be upsetting? must he be upsetting? must we be upsetting? must you be upsetting? must they be upsetting?
Perfect
must I have upset? must you have upset? must he have upset? must we have upset? must you have upset? must they have upset?
V-ing perfect
must I have been upsetting? must you have been upsetting? must he have been upsetting? must we have been upsetting? must you have been upsetting? must they have been upsetting?
Interro-negative form
Simple form
mustn't I upset? mustn't you upset? mustn't he upset? mustn't we upset? mustn't you upset? mustn't they upset?
V-ing form
mustn't I be upsetting? mustn't you be upsetting? mustn't he be upsetting? mustn't we be upsetting? mustn't you be upsetting? mustn't they be upsetting?
Perfect
mustn't I have upset? mustn't you have upset? mustn't he have upset? mustn't we have upset? mustn't you have upset? mustn't they have upset?
V-ing perfect
mustn't I have been upsetting? mustn't you have been upsetting? mustn't he have been upsetting? mustn't we have been upsetting? mustn't you have been upsetting? mustn't they have been upsetting?