English verb conjugation
MUST POSTFIX

Regular verb: postfix - postfixed - postfixed

Affirmation

Simple form	V-ing form
I must postfix you must postfix she must postfix we must postfix you must postfix they must postfix	I must be postfixing you must be postfixing she must be postfixing we must be postfixing you must be postfixing they must be postfixing
Perfect	V-ing perfect
I must have postfixed you must have postfixed she must have postfixed we must have postfixed you must have postfixed they must have postfixed	I must have been postfixing you must have been postfixing she must have been postfixing we must have been postfixing you must have been postfixing they must have been postfixing

Negation

Simple form	V-ing form
I must not postfix you must not postfix she must not postfix we must not postfix you must not postfix they must not postfix	I must not be postfixing you must not be postfixing she must not be postfixing we must not be postfixing you must not be postfixing they must not be postfixing
Perfect	V-ing perfect
I must not have postfixed you must not have postfixed she must not have postfixed we must not have postfixed you must not have postfixed they must not have postfixed	I must not have been postfixing you must not have been postfixing she must not have been postfixing we must not have been postfixing you must not have been postfixing they must not have been postfixing

Interrogative form

Simple form	V-ing form
must I postfix? must you postfix? must she postfix? must we postfix? must you postfix? must they postfix?	must I be postfixing? must you be postfixing? must she be postfixing? must we be postfixing? must you be postfixing? must they be postfixing?
Perfect	V-ing perfect
must I have postfixed? must you have postfixed? must she have postfixed? must we have postfixed? must you have postfixed? must they have postfixed?	must I have been postfixing? must you have been postfixing? must she have been postfixing? must we have been postfixing? must you have been postfixing? must they have been postfixing?

Interro-negative form

Simple form	V-ing form
must I not postfix? must you not postfix? must she not postfix? must we not postfix? must you not postfix? must they not postfix?	must I not be postfixing? must you not be postfixing? must she not be postfixing? must we not be postfixing? must you not be postfixing? must they not be postfixing?
Perfect	V-ing perfect
must I not have postfixed? must you not have postfixed? must she not have postfixed? must we not have postfixed? must you not have postfixed? must they not have postfixed?	must I not have been postfixing? must you not have been postfixing? must she not have been postfixing? must we not have been postfixing? must you not have been postfixing? must they not have been postfixing?