English verb conjugation
COULD SNIVEL

Regular verb: snivel - snivelled - snivelled

Affirmation

Simple form	V-ing form
I could snivel you could snivel he could snivel we could snivel you could snivel they could snivel	I could be snivelling you could be snivelling he could be snivelling we could be snivelling you could be snivelling they could be snivelling
Perfect	V-ing perfect
I could have snivelled you could have snivelled he could have snivelled we could have snivelled you could have snivelled they could have snivelled	I could have been snivelling you could have been snivelling he could have been snivelling we could have been snivelling you could have been snivelling they could have been snivelling

Negation

Simple form	V-ing form
I could not snivel you could not snivel he could not snivel we could not snivel you could not snivel they could not snivel	I could not be snivelling you could not be snivelling he could not be snivelling we could not be snivelling you could not be snivelling they could not be snivelling
Perfect	V-ing perfect
I could not have snivelled you could not have snivelled he could not have snivelled we could not have snivelled you could not have snivelled they could not have snivelled	I could not have been snivelling you could not have been snivelling he could not have been snivelling we could not have been snivelling you could not have been snivelling they could not have been snivelling

Interrogative form

Simple form	V-ing form
could I snivel? could you snivel? could he snivel? could we snivel? could you snivel? could they snivel?	could I be snivelling? could you be snivelling? could he be snivelling? could we be snivelling? could you be snivelling? could they be snivelling?
Perfect	V-ing perfect
could I have snivelled? could you have snivelled? could he have snivelled? could we have snivelled? could you have snivelled? could they have snivelled?	could I have been snivelling? could you have been snivelling? could he have been snivelling? could we have been snivelling? could you have been snivelling? could they have been snivelling?

Interro-negative form

Simple form	V-ing form
could I not snivel? could you not snivel? could he not snivel? could we not snivel? could you not snivel? could they not snivel?	could I not be snivelling? could you not be snivelling? could he not be snivelling? could we not be snivelling? could you not be snivelling? could they not be snivelling?
Perfect	V-ing perfect
could I not have snivelled? could you not have snivelled? could he not have snivelled? could we not have snivelled? could you not have snivelled? could they not have snivelled?	could I not have been snivelling? could you not have been snivelling? could he not have been snivelling? could we not have been snivelling? could you not have been snivelling? could they not have been snivelling?