English verb conjugation
CAN FELL

Regular verb: fell - felled - felled

Affirmation

Simple form	V-ing form
I can fell you can fell he can fell we can fell you can fell they can fell	I can be felling you can be felling he can be felling we can be felling you can be felling they can be felling
Perfect	V-ing perfect
I can have felled you can have felled he can have felled we can have felled you can have felled they can have felled	I can have been felling you can have been felling he can have been felling we can have been felling you can have been felling they can have been felling

Negation

Simple form	V-ing form
I cannot fell you cannot fell he cannot fell we cannot fell you cannot fell they cannot fell	I cannot be felling you cannot be felling he cannot be felling we cannot be felling you cannot be felling they cannot be felling
Perfect	V-ing perfect
I cannot have felled you cannot have felled he cannot have felled we cannot have felled you cannot have felled they cannot have felled	I cannot have been felling you cannot have been felling he cannot have been felling we cannot have been felling you cannot have been felling they cannot have been felling

Interrogative form

Simple form	V-ing form
can I fell? can you fell? can he fell? can we fell? can you fell? can they fell?	can I be felling? can you be felling? can he be felling? can we be felling? can you be felling? can they be felling?
Perfect	V-ing perfect
can I have felled? can you have felled? can he have felled? can we have felled? can you have felled? can they have felled?	can I have been felling? can you have been felling? can he have been felling? can we have been felling? can you have been felling? can they have been felling?

Interro-negative form

Simple form	V-ing form
can I not fell? can you not fell? can he not fell? can we not fell? can you not fell? can they not fell?	can I not be felling? can you not be felling? can he not be felling? can we not be felling? can you not be felling? can they not be felling?
Perfect	V-ing perfect
can I not have felled? can you not have felled? can he not have felled? can we not have felled? can you not have felled? can they not have felled?	can I not have been felling? can you not have been felling? can he not have been felling? can we not have been felling? can you not have been felling? can they not have been felling?