English verb conjugation
MUST EXCAVATE

Regular verb: excavate - excavated - excavated

Affirmation

Simple form	V-ing form
I must excavate you must excavate he must excavate we must excavate you must excavate they must excavate	I must be excavating you must be excavating he must be excavating we must be excavating you must be excavating they must be excavating
Perfect	V-ing perfect
I must have excavated you must have excavated he must have excavated we must have excavated you must have excavated they must have excavated	I must have been excavating you must have been excavating he must have been excavating we must have been excavating you must have been excavating they must have been excavating

Negation

Simple form	V-ing form
I must not excavate you must not excavate he must not excavate we must not excavate you must not excavate they must not excavate	I must not be excavating you must not be excavating he must not be excavating we must not be excavating you must not be excavating they must not be excavating
Perfect	V-ing perfect
I must not have excavated you must not have excavated he must not have excavated we must not have excavated you must not have excavated they must not have excavated	I must not have been excavating you must not have been excavating he must not have been excavating we must not have been excavating you must not have been excavating they must not have been excavating

Interrogative form

Simple form	V-ing form
must I excavate? must you excavate? must he excavate? must we excavate? must you excavate? must they excavate?	must I be excavating? must you be excavating? must he be excavating? must we be excavating? must you be excavating? must they be excavating?
Perfect	V-ing perfect
must I have excavated? must you have excavated? must he have excavated? must we have excavated? must you have excavated? must they have excavated?	must I have been excavating? must you have been excavating? must he have been excavating? must we have been excavating? must you have been excavating? must they have been excavating?

Interro-negative form

Simple form	V-ing form
must I not excavate? must you not excavate? must he not excavate? must we not excavate? must you not excavate? must they not excavate?	must I not be excavating? must you not be excavating? must he not be excavating? must we not be excavating? must you not be excavating? must they not be excavating?
Perfect	V-ing perfect
must I not have excavated? must you not have excavated? must he not have excavated? must we not have excavated? must you not have excavated? must they not have excavated?	must I not have been excavating? must you not have been excavating? must he not have been excavating? must we not have been excavating? must you not have been excavating? must they not have been excavating?