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 mustn't excavate you mustn't excavate he mustn't excavate we mustn't excavate you mustn't excavate they mustn't excavate	I mustn't be excavating you mustn't be excavating he mustn't be excavating we mustn't be excavating you mustn't be excavating they mustn't be excavating
Perfect	V-ing perfect
I mustn't have excavated you mustn't have excavated he mustn't have excavated we mustn't have excavated you mustn't have excavated they mustn't have excavated	I mustn't have been excavating you mustn't have been excavating he mustn't have been excavating we mustn't have been excavating you mustn't have been excavating they mustn't 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
mustn't I excavate? mustn't you excavate? mustn't he excavate? mustn't we excavate? mustn't you excavate? mustn't they excavate?	mustn't I be excavating? mustn't you be excavating? mustn't he be excavating? mustn't we be excavating? mustn't you be excavating? mustn't they be excavating?
Perfect	V-ing perfect
mustn't I have excavated? mustn't you have excavated? mustn't he have excavated? mustn't we have excavated? mustn't you have excavated? mustn't they have excavated?	mustn't I have been excavating? mustn't you have been excavating? mustn't he have been excavating? mustn't we have been excavating? mustn't you have been excavating? mustn't they have been excavating?