I must tunnel you must tunnel she must tunnel we must tunnel you must tunnel they must tunnel
V-ing form
I must be tunnelling you must be tunnelling she must be tunnelling we must be tunnelling you must be tunnelling they must be tunnelling
Perfect
I must have tunnelled you must have tunnelled she must have tunnelled we must have tunnelled you must have tunnelled they must have tunnelled
V-ing perfect
I must have been tunnelling you must have been tunnelling she must have been tunnelling we must have been tunnelling you must have been tunnelling they must have been tunnelling
Negation
Simple form
I must not tunnel you must not tunnel she must not tunnel we must not tunnel you must not tunnel they must not tunnel
V-ing form
I must not be tunnelling you must not be tunnelling she must not be tunnelling we must not be tunnelling you must not be tunnelling they must not be tunnelling
Perfect
I must not have tunnelled you must not have tunnelled she must not have tunnelled we must not have tunnelled you must not have tunnelled they must not have tunnelled
V-ing perfect
I must not have been tunnelling you must not have been tunnelling she must not have been tunnelling we must not have been tunnelling you must not have been tunnelling they must not have been tunnelling
Interrogative form
Simple form
must I tunnel? must you tunnel? must she tunnel? must we tunnel? must you tunnel? must they tunnel?
V-ing form
must I be tunnelling? must you be tunnelling? must she be tunnelling? must we be tunnelling? must you be tunnelling? must they be tunnelling?
Perfect
must I have tunnelled? must you have tunnelled? must she have tunnelled? must we have tunnelled? must you have tunnelled? must they have tunnelled?
V-ing perfect
must I have been tunnelling? must you have been tunnelling? must she have been tunnelling? must we have been tunnelling? must you have been tunnelling? must they have been tunnelling?
Interro-negative form
Simple form
must I not tunnel? must you not tunnel? must she not tunnel? must we not tunnel? must you not tunnel? must they not tunnel?
V-ing form
must I not be tunnelling? must you not be tunnelling? must she not be tunnelling? must we not be tunnelling? must you not be tunnelling? must they not be tunnelling?
Perfect
must I not have tunnelled? must you not have tunnelled? must she not have tunnelled? must we not have tunnelled? must you not have tunnelled? must they not have tunnelled?
V-ing perfect
must I not have been tunnelling? must you not have been tunnelling? must she not have been tunnelling? must we not have been tunnelling? must you not have been tunnelling? must they not have been tunnelling?