English verb conjugation
CAN TUNNEL

Regular verb: tunnel - tunnelled - tunnelled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not tunnel? can you not tunnel? can he not tunnel? can we not tunnel? can you not tunnel? can they not tunnel?	can I not be tunnelling? can you not be tunnelling? can he not be tunnelling? can we not be tunnelling? can you not be tunnelling? can they not be tunnelling?
Perfect	V-ing perfect
can I not have tunnelled? can you not have tunnelled? can he not have tunnelled? can we not have tunnelled? can you not have tunnelled? can they not have tunnelled?	can I not have been tunnelling? can you not have been tunnelling? can he not have been tunnelling? can we not have been tunnelling? can you not have been tunnelling? can they not have been tunnelling?