English verb conjugation
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Irregular verb: upset - upset - upset

Affirmation

Simple form	V-ing form
I must upset you must upset he must upset we must upset you must upset they must upset	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	V-ing 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	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	V-ing form
I must not upset you must not upset he must not upset we must not upset you must not upset they must not upset	I must not be upsetting you must not be upsetting he must not be upsetting we must not be upsetting you must not be upsetting they must not be upsetting
Perfect	V-ing perfect
I must not have upset you must not have upset he must not have upset we must not have upset you must not have upset they must not have upset	I must not have been upsetting you must not have been upsetting he must not have been upsetting we must not have been upsetting you must not have been upsetting they must not have been upsetting

Interrogative form

Simple form	V-ing form
must I upset? must you upset? must he upset? must we upset? must you upset? must they upset?	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	V-ing 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?	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	V-ing form
must I not upset? must you not upset? must he not upset? must we not upset? must you not upset? must they not upset?	must I not be upsetting? must you not be upsetting? must he not be upsetting? must we not be upsetting? must you not be upsetting? must they not be upsetting?
Perfect	V-ing perfect
must I not have upset? must you not have upset? must he not have upset? must we not have upset? must you not have upset? must they not have upset?	must I not have been upsetting? must you not have been upsetting? must he not have been upsetting? must we not have been upsetting? must you not have been upsetting? must they not have been upsetting?