English verb conjugation
MUST TUNNEL

Regular verb: tunnel - tunnelled - tunnelled

Affirmation

Simple form	V-ing form
I must tunnel you must tunnel he must tunnel we must tunnel you must tunnel they must tunnel	I must be tunnelling you must be tunnelling he must be tunnelling we must be tunnelling you must be tunnelling they must be tunnelling
Perfect	V-ing perfect
I must have tunnelled you must have tunnelled he must have tunnelled we must have tunnelled you must have tunnelled they must have tunnelled	I must have been tunnelling you must have been tunnelling he must have been tunnelling we must have been tunnelling you must have been tunnelling they must have been tunnelling

Negation

Simple form	V-ing form
I mustn't tunnel you mustn't tunnel he mustn't tunnel we mustn't tunnel you mustn't tunnel they mustn't tunnel	I mustn't be tunnelling you mustn't be tunnelling he mustn't be tunnelling we mustn't be tunnelling you mustn't be tunnelling they mustn't be tunnelling
Perfect	V-ing perfect
I mustn't have tunnelled you mustn't have tunnelled he mustn't have tunnelled we mustn't have tunnelled you mustn't have tunnelled they mustn't have tunnelled	I mustn't have been tunnelling you mustn't have been tunnelling he mustn't have been tunnelling we mustn't have been tunnelling you mustn't have been tunnelling they mustn't have been tunnelling

Interrogative form

Simple form	V-ing form
must I tunnel? must you tunnel? must he tunnel? must we tunnel? must you tunnel? must they tunnel?	must I be tunnelling? must you be tunnelling? must he be tunnelling? must we be tunnelling? must you be tunnelling? must they be tunnelling?
Perfect	V-ing perfect
must I have tunnelled? must you have tunnelled? must he have tunnelled? must we have tunnelled? must you have tunnelled? must they have tunnelled?	must I have been tunnelling? must you have been tunnelling? must he have been tunnelling? must we have been tunnelling? must you have been tunnelling? must they have been tunnelling?

Interro-negative form

Simple form	V-ing form
mustn't I tunnel? mustn't you tunnel? mustn't he tunnel? mustn't we tunnel? mustn't you tunnel? mustn't they tunnel?	mustn't I be tunnelling? mustn't you be tunnelling? mustn't he be tunnelling? mustn't we be tunnelling? mustn't you be tunnelling? mustn't they be tunnelling?
Perfect	V-ing perfect
mustn't I have tunnelled? mustn't you have tunnelled? mustn't he have tunnelled? mustn't we have tunnelled? mustn't you have tunnelled? mustn't they have tunnelled?	mustn't I have been tunnelling? mustn't you have been tunnelling? mustn't he have been tunnelling? mustn't we have been tunnelling? mustn't you have been tunnelling? mustn't they have been tunnelling?