English verb conjugation
MUST ENDORSE

Regular verb: endorse - endorsed - endorsed

Affirmation

Simple form	V-ing form
I must endorse you must endorse she must endorse we must endorse you must endorse they must endorse	I must be endorsing you must be endorsing she must be endorsing we must be endorsing you must be endorsing they must be endorsing
Perfect	V-ing perfect
I must have endorsed you must have endorsed she must have endorsed we must have endorsed you must have endorsed they must have endorsed	I must have been endorsing you must have been endorsing she must have been endorsing we must have been endorsing you must have been endorsing they must have been endorsing

Negation

Simple form	V-ing form
I must not endorse you must not endorse she must not endorse we must not endorse you must not endorse they must not endorse	I must not be endorsing you must not be endorsing she must not be endorsing we must not be endorsing you must not be endorsing they must not be endorsing
Perfect	V-ing perfect
I must not have endorsed you must not have endorsed she must not have endorsed we must not have endorsed you must not have endorsed they must not have endorsed	I must not have been endorsing you must not have been endorsing she must not have been endorsing we must not have been endorsing you must not have been endorsing they must not have been endorsing

Interrogative form

Simple form	V-ing form
must I endorse? must you endorse? must she endorse? must we endorse? must you endorse? must they endorse?	must I be endorsing? must you be endorsing? must she be endorsing? must we be endorsing? must you be endorsing? must they be endorsing?
Perfect	V-ing perfect
must I have endorsed? must you have endorsed? must she have endorsed? must we have endorsed? must you have endorsed? must they have endorsed?	must I have been endorsing? must you have been endorsing? must she have been endorsing? must we have been endorsing? must you have been endorsing? must they have been endorsing?

Interro-negative form

Simple form	V-ing form
must I not endorse? must you not endorse? must she not endorse? must we not endorse? must you not endorse? must they not endorse?	must I not be endorsing? must you not be endorsing? must she not be endorsing? must we not be endorsing? must you not be endorsing? must they not be endorsing?
Perfect	V-ing perfect
must I not have endorsed? must you not have endorsed? must she not have endorsed? must we not have endorsed? must you not have endorsed? must they not have endorsed?	must I not have been endorsing? must you not have been endorsing? must she not have been endorsing? must we not have been endorsing? must you not have been endorsing? must they not have been endorsing?